404135640 has 48 divisors (see below), whose sum is σ = 1313442000. Its totient is φ = 107769408.

The previous prime is 404135597. The next prime is 404135671. The reversal of 404135640 is 46531404.

404135640 is a `hidden beast` number, since 4 + 0 + 4 + 13 + 5 + 640 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 560940 + ... + 561659.

It is an arithmetic number, because the mean of its divisors is an integer number (27363375).

Almost surely, 2^404135640 is an apocalyptic number.

404135640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404135640 is an abundant number, since it is smaller than the sum of its proper divisors (909306360).

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

404135640 is a wasteful number, since it uses less digits than its factorization.

404135640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122616 (or 1122609 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 404135640 is about 20103.1251301881. The cubic root of 404135640 is about 739.3369029478.

The spelling of 404135640 in words is "four hundred four million, one hundred thirty-five thousand, six hundred forty".