40641540 has 48 divisors (see below), whose sum is σ = 116878272. Its totient is φ = 10544256.

The previous prime is 40641539. The next prime is 40641541. The reversal of 40641540 is 4514604.

It is an interprime number because it is at equal distance from previous prime (40641539) and next prime (40641541).

It is a self number, because there is not a number n which added to its sum of digits gives 40641540.

It is not an unprimeable number, because it can be changed into a prime (40641541) 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, 6934 + ... + 11373.

It is an arithmetic number, because the mean of its divisors is an integer number (2434964).

Almost surely, 2^40641540 is an apocalyptic number.

It is an amenable number.

40641540 is an abundant number, since it is smaller than the sum of its proper divisors (76236732).

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

40641540 is a wasteful number, since it uses less digits than its factorization.

40641540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18356 (or 18354 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 40641540 is about 6375.0717643020. The cubic root of 40641540 is about 343.8138640571.

Subtracting from 40641540 its product of nonzero digits (1920), we obtain a triangular number (40639620 = T₉₀₁₅).

The spelling of 40641540 in words is "forty million, six hundred forty-one thousand, five hundred forty".