40635640 has 16 divisors (see below), whose sum is σ = 91430280. Its totient is φ = 16254240.

The previous prime is 40635631. The next prime is 40635649. The reversal of 40635640 is 4653604.

It is an interprime number because it is at equal distance from previous prime (40635631) and next prime (40635649).

It is a junction number, because it is equal to n+sod(n) for n = 40635599 and 40635608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40635649) 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, 507906 + ... + 507985.

Almost surely, 2^40635640 is an apocalyptic number.

40635640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40635640 is an abundant number, since it is smaller than the sum of its proper divisors (50794640).

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

40635640 is a wasteful number, since it uses less digits than its factorization.

40635640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015902 (or 1015898 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 40635640 is about 6374.6090076176. The cubic root of 40635640 is about 343.7972259083.

It can be divided in two parts, 406 and 35640, that added together give a triangular number (36046 = T₂₆₈).

The spelling of 40635640 in words is "forty million, six hundred thirty-five thousand, six hundred forty".