401569905 has 32 divisors (see below), whose sum is σ = 717235200. Its totient is φ = 190169280.

The previous prime is 401569901. The next prime is 401569913. The reversal of 401569905 is 509965104.

It is not a de Polignac number, because 401569905 - 2² = 401569901 is a prime.

It is a super-2 number, since 2×401569905² = 322516777203418050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401569901) 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 31 ways as a sum of consecutive naturals, for example, 21205 + ... + 35394.

It is an arithmetic number, because the mean of its divisors is an integer number (22413600).

Almost surely, 2^401569905 is an apocalyptic number.

It is an amenable number.

401569905 is a deficient number, since it is larger than the sum of its proper divisors (315665295).

401569905 is a wasteful number, since it uses less digits than its factorization.

401569905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56661.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 401569905 is about 20039.2091909836. The cubic root of 401569905 is about 737.7689713169.

It can be divided in two parts, 4015 and 69905, that added together give a triangular number (73920 = T₃₈₄).

The spelling of 401569905 in words is "four hundred one million, five hundred sixty-nine thousand, nine hundred five".