400971881 has 2 divisors, whose sum is σ = 400971882. Its totient is φ = 400971880.

The previous prime is 400971863. The next prime is 400971913. The reversal of 400971881 is 188179004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334304656 + 66667225 = 18284^2 + 8165^2 .

It is a cyclic number.

It is not a de Polignac number, because 400971881 - 2¹⁴ = 400955497 is a prime.

It is a super-2 number, since 2×400971881² = 321556898705356322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400971821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200485940 + 200485941.

It is an arithmetic number, because the mean of its divisors is an integer number (200485941).

Almost surely, 2^400971881 is an apocalyptic number.

It is an amenable number.

400971881 is a deficient number, since it is larger than the sum of its proper divisors (1).

400971881 is an equidigital number, since it uses as much as digits as its factorization.

400971881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 400971881 is about 20024.2822842668. The cubic root of 400971881 is about 737.4025571153.

It can be divided in two parts, 40097 and 1881, that multiplied together give a palindrome (75422457).

The spelling of 400971881 in words is "four hundred million, nine hundred seventy-one thousand, eight hundred eighty-one".