40315520 has 64 divisors (see below), whose sum is σ = 110160000. Its totient is φ = 13820928.

The previous prime is 40315489. The next prime is 40315523. The reversal of 40315520 is 2551304.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 40315492 and 40315501.

It is not an unprimeable number, because it can be changed into a prime (40315523) 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, 20 + ... + 8979.

It is an arithmetic number, because the mean of its divisors is an integer number (1721250).

Almost surely, 2^40315520 is an apocalyptic number.

40315520 is a gapful number since it is divisible by the number (40) 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 40315520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55080000).

40315520 is an abundant number, since it is smaller than the sum of its proper divisors (69844480).

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

40315520 is an equidigital number, since it uses as much as digits as its factorization.

40315520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9025 (or 9013 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 40315520 is about 6349.4503699139. The cubic root of 40315520 is about 342.8920546460.

Adding to 40315520 its reverse (2551304), we get a palindrome (42866824).

The spelling of 40315520 in words is "forty million, three hundred fifteen thousand, five hundred twenty".