400931109 has 12 divisors (see below), whose sum is σ = 582324652. Its totient is φ = 265809600.

The previous prime is 400931099. The next prime is 400931117. The reversal of 400931109 is 901139004.

It can be written as a sum of positive squares in 2 ways, for example, as 3526884 + 397404225 = 1878^2 + 19935^2 .

It is not a de Polignac number, because 400931109 - 2⁴ = 400931093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400931129) 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 in 11 ways as a sum of consecutive naturals, for example, 121432 + ... + 124689.

Almost surely, 2^400931109 is an apocalyptic number.

It is an amenable number.

400931109 is a deficient number, since it is larger than the sum of its proper divisors (181393543).

400931109 is a wasteful number, since it uses less digits than its factorization.

400931109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246308 (or 246305 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 400931109 is about 20023.2641944314. The cubic root of 400931109 is about 737.3775625146.

The spelling of 400931109 in words is "four hundred million, nine hundred thirty-one thousand, one hundred nine".