400831407 has 12 divisors (see below), whose sum is σ = 579198984. Its totient is φ = 267119280.

The previous prime is 400831367. The next prime is 400831433. The reversal of 400831407 is 704138004.

It is not a de Polignac number, because 400831407 - 2⁷ = 400831279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400831007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22432 + ... + 36122.

It is an arithmetic number, because the mean of its divisors is an integer number (48266582).

Almost surely, 2^400831407 is an apocalyptic number.

400831407 is a deficient number, since it is larger than the sum of its proper divisors (178367577).

400831407 is a wasteful number, since it uses less digits than its factorization.

400831407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16950 (or 16947 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 400831407 is about 20020.7743856226. The cubic root of 400831407 is about 737.3164347124.

The spelling of 400831407 in words is "four hundred million, eight hundred thirty-one thousand, four hundred seven".