401397859 has 2 divisors, whose sum is σ = 401397860. Its totient is φ = 401397858.

The previous prime is 401397853. The next prime is 401397869. The reversal of 401397859 is 958793104.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401397859 - 2²⁷ = 267180131 is a prime.

It is a super-2 number, since 2×401397859² = 322240482419567762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401397853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200698929 + 200698930.

It is an arithmetic number, because the mean of its divisors is an integer number (200698930).

Almost surely, 2^401397859 is an apocalyptic number.

401397859 is a deficient number, since it is larger than the sum of its proper divisors (1).

401397859 is an equidigital number, since it uses as much as digits as its factorization.

401397859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 401397859 is about 20034.9159968291. The cubic root of 401397859 is about 737.6635946189.

The spelling of 401397859 in words is "four hundred one million, three hundred ninety-seven thousand, eight hundred fifty-nine".