401556723 has 12 divisors (see below), whose sum is σ = 538296600. Its totient is φ = 266268352.

The previous prime is 401556719. The next prime is 401556737. The reversal of 401556723 is 327655104.

It is not a de Polignac number, because 401556723 - 2² = 401556719 is a prime.

It is a super-2 number, since 2×401556723² = 322495603572997458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401556703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114703 + ... + 118151.

It is an arithmetic number, because the mean of its divisors is an integer number (44858050).

Almost surely, 2^401556723 is an apocalyptic number.

401556723 is a deficient number, since it is larger than the sum of its proper divisors (136739877).

401556723 is an equidigital number, since it uses as much as digits as its factorization.

401556723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846 (or 3649 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 401556723 is about 20038.8802830897. The cubic root of 401556723 is about 737.7608985199.

The spelling of 401556723 in words is "four hundred one million, five hundred fifty-six thousand, seven hundred twenty-three".