40534640 has 20 divisors (see below), whose sum is σ = 94243224. Its totient is φ = 16213824.

The previous prime is 40534597. The next prime is 40534643. The reversal of 40534640 is 4643504.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40534643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253262 + ... + 253421.

Almost surely, 2^40534640 is an apocalyptic number.

40534640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40534640 is an abundant number, since it is smaller than the sum of its proper divisors (53708584).

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

40534640 is a wasteful number, since it uses less digits than its factorization.

40534640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506696 (or 506690 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 40534640 is about 6366.6820244143. The cubic root of 40534640 is about 343.5121532637.

The spelling of 40534640 in words is "forty million, five hundred thirty-four thousand, six hundred forty".