40257636 has 24 divisors (see below), whose sum is σ = 98019264. Its totient is φ = 12835680.

The previous prime is 40257631. The next prime is 40257641. The reversal of 40257636 is 63675204.

It is an interprime number because it is at equal distance from previous prime (40257631) and next prime (40257641).

It is a junction number, because it is equal to n+sod(n) for n = 40257597 and 40257606.

It is not an unprimeable number, because it can be changed into a prime (40257631) 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, 72655 + ... + 73206.

It is an arithmetic number, because the mean of its divisors is an integer number (4084136).

Almost surely, 2^40257636 is an apocalyptic number.

40257636 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

It is an amenable number.

40257636 is an abundant number, since it is smaller than the sum of its proper divisors (57761628).

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

40257636 is a wasteful number, since it uses less digits than its factorization.

40257636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145891 (or 145889 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 40257636 is about 6344.8905427911. The cubic root of 40257636 is about 342.7278708086.

The spelling of 40257636 in words is "forty million, two hundred fifty-seven thousand, six hundred thirty-six".