404129656 has 48 divisors (see below), whose sum is σ = 892148040. Its totient is φ = 171097920.

The previous prime is 404129647. The next prime is 404129659. The reversal of 404129656 is 656921404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404129659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26326 + ... + 38746.

Almost surely, 2^404129656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404129656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446074020).

404129656 is an abundant number, since it is smaller than the sum of its proper divisors (488018384).

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

404129656 is a wasteful number, since it uses less digits than its factorization.

404129656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12524 (or 12513 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 404129656 is about 20102.9762970561. The cubic root of 404129656 is about 739.3332538315. Note that the first 3 decimals are identical.

The spelling of 404129656 in words is "four hundred four million, one hundred twenty-nine thousand, six hundred fifty-six".