404243136 has 336 divisors, whose sum is σ = 1397934720. Its totient is φ = 114462720.

The previous prime is 404243123. The next prime is 404243141. The reversal of 404243136 is 631342404.

404243136 is a `hidden beast` number, since 404 + 243 + 13 + 6 = 666.

It is a super-2 number, since 2×404243136² = 326825026006228992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2908155 + ... + 2908293.

It is an arithmetic number, because the mean of its divisors is an integer number (4160520).

Almost surely, 2^404243136 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 404243136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698967360).

404243136 is an abundant number, since it is smaller than the sum of its proper divisors (993691584).

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

404243136 is a wasteful number, since it uses less digits than its factorization.

404243136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 404243136 is about 20105.7985665827. The cubic root of 404243136 is about 739.4024491872.

The spelling of 404243136 in words is "four hundred four million, two hundred forty-three thousand, one hundred thirty-six".