1315494640 has 40 divisors (see below), whose sum is σ = 3219503760. Its totient is φ = 498502656.

The previous prime is 1315494619. The next prime is 1315494647. The reversal of 1315494640 is 464945131.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1315494640² = 3461052295737459200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1315494640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315494647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431209 + ... + 434248.

It is an arithmetic number, because the mean of its divisors is an integer number (80487594).

Almost surely, 2^1315494640 is an apocalyptic number.

1315494640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1315494640 is an abundant number, since it is smaller than the sum of its proper divisors (1904009120).

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

1315494640 is a wasteful number, since it uses less digits than its factorization.

1315494640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865489 (or 865483 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1315494640 is about 36269.7482759393. The cubic root of 1315494640 is about 1095.7118561612.

The spelling of 1315494640 in words is "one billion, three hundred fifteen million, four hundred ninety-four thousand, six hundred forty".