401565605 has 16 divisors (see below), whose sum is σ = 563528064. Its totient is φ = 268954560.

The previous prime is 401565601. The next prime is 401565629. The reversal of 401565605 is 506565104.

It is not a de Polignac number, because 401565605 - 2² = 401565601 is a prime.

It is a super-2 number, since 2×401565605² = 322509870238032050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401565601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131906 + ... + 134915.

It is an arithmetic number, because the mean of its divisors is an integer number (35220504).

Almost surely, 2^401565605 is an apocalyptic number.

It is an amenable number.

401565605 is a deficient number, since it is larger than the sum of its proper divisors (161962459).

401565605 is a wasteful number, since it uses less digits than its factorization.

401565605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266876.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 401565605 is about 20039.1019010334. The cubic root of 401565605 is about 737.7663379706.

The spelling of 401565605 in words is "four hundred one million, five hundred sixty-five thousand, six hundred five".