401645904 has 40 divisors (see below), whose sum is σ = 1131912672. Its totient is φ = 121710720.

The previous prime is 401645891. The next prime is 401645917. The reversal of 401645904 is 409546104.

It is an interprime number because it is at equal distance from previous prime (401645891) and next prime (401645917).

It is a super-2 number, since 2×401645904² = 322638864399954432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 379819 + ... + 380874.

Almost surely, 2^401645904 is an apocalyptic number.

401645904 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

401645904 is an abundant number, since it is smaller than the sum of its proper divisors (730266768).

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

401645904 is a wasteful number, since it uses less digits than its factorization.

401645904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760715 (or 760709 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 401645904 is about 20041.1053587371. The cubic root of 401645904 is about 737.8155104678.

The spelling of 401645904 in words is "four hundred one million, six hundred forty-five thousand, nine hundred four".