1315491840 has 520 divisors, whose sum is σ = 5161706088. Its totient is φ = 318504960.

The previous prime is 1315491829. The next prime is 1315491871. The reversal of 1315491840 is 481945131.

1315491840 is a `hidden beast` number, since 1 + 31 + 549 + 1 + 84 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 40144896 + 1275346944 = 6336^2 + 35712^2 .

It is a tau number, because it is divible by the number of its divisors (520).

It is a super-2 number, since 2×1315491840² = 3461037562213171200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1315491795 and 1315491804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21565410 + ... + 21565470.

Almost surely, 2^1315491840 is an apocalyptic number.

1315491840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1315491840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2580853044).

1315491840 is an abundant number, since it is smaller than the sum of its proper divisors (3846214248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1315491840 is an equidigital number, since it uses as much as digits as its factorization.

1315491840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1315491840 is about 36269.7096762574. The cubic root of 1315491840 is about 1095.7110787615.

The spelling of 1315491840 in words is "one billion, three hundred fifteen million, four hundred ninety-one thousand, eight hundred forty".