401536865 has 8 divisors (see below), whose sum is σ = 488445288. Its totient is φ = 316828800.

The previous prime is 401536859. The next prime is 401536897. The reversal of 401536865 is 568635104.

It can be written as a sum of positive squares in 4 ways, for example, as 49336576 + 352200289 = 7024^2 + 18767^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 401536865 - 2²⁴ = 384759649 is a prime.

It is a super-2 number, since 2×401536865² = 322463707908056450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549686 + ... + 550415.

It is an arithmetic number, because the mean of its divisors is an integer number (61055661).

Almost surely, 2^401536865 is an apocalyptic number.

It is an amenable number.

401536865 is a deficient number, since it is larger than the sum of its proper divisors (86908423).

401536865 is a wasteful number, since it uses less digits than its factorization.

401536865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100179.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 401536865 is about 20038.3847901970. The cubic root of 401536865 is about 737.7487369359.

The spelling of 401536865 in words is "four hundred one million, five hundred thirty-six thousand, eight hundred sixty-five".