40515720 has 128 divisors (see below), whose sum is σ = 140313600. Its totient is φ = 9167616.

The previous prime is 40515707. The next prime is 40515721. The reversal of 40515720 is 2751504.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (40515721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116587 + ... + 116933.

It is an arithmetic number, because the mean of its divisors is an integer number (1096200).

Almost surely, 2^40515720 is an apocalyptic number.

40515720 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 40515720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70156800).

40515720 is an abundant number, since it is smaller than the sum of its proper divisors (99797880).

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

40515720 is a wasteful number, since it uses less digits than its factorization.

40515720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 40515720 is about 6365.1959906982. The cubic root of 40515720 is about 343.4586988899.

The spelling of 40515720 in words is "forty million, five hundred fifteen thousand, seven hundred twenty".