400812161 has 8 divisors (see below), whose sum is σ = 416361000. Its totient is φ = 385378560.

The previous prime is 400812149. The next prime is 400812173. The reversal of 400812161 is 161218004.

It is an interprime number because it is at equal distance from previous prime (400812149) and next prime (400812173).

It can be written as a sum of positive squares in 4 ways, for example, as 120450625 + 280361536 = 10975^2 + 16744^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 400812161 - 2¹⁴ = 400795777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400812131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21686 + ... + 35663.

It is an arithmetic number, because the mean of its divisors is an integer number (52045125).

Almost surely, 2^400812161 is an apocalyptic number.

It is an amenable number.

400812161 is a deficient number, since it is larger than the sum of its proper divisors (15548839).

400812161 is a wasteful number, since it uses less digits than its factorization.

400812161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57619.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 400812161 is about 20020.2937291140. The cubic root of 400812161 is about 737.3046337249.

The spelling of 400812161 in words is "four hundred million, eight hundred twelve thousand, one hundred sixty-one".