40640515 has 16 divisors (see below), whose sum is σ = 49645440. Its totient is φ = 31933440.

The previous prime is 40640507. The next prime is 40640519. The reversal of 40640515 is 51504604.

It is not a de Polignac number, because 40640515 - 2³ = 40640507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40640515.

It is not an unprimeable number, because it can be changed into a prime (40640519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120427 + ... + 120763.

It is an arithmetic number, because the mean of its divisors is an integer number (3102840).

Almost surely, 2^40640515 is an apocalyptic number.

40640515 is a deficient number, since it is larger than the sum of its proper divisors (9004925).

40640515 is a wasteful number, since it uses less digits than its factorization.

40640515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 40640515 is about 6374.9913725432. The cubic root of 40640515 is about 343.8109736468.

The spelling of 40640515 in words is "forty million, six hundred forty thousand, five hundred fifteen".