400697977 has 2 divisors, whose sum is σ = 400697978. Its totient is φ = 400697976.

The previous prime is 400697933. The next prime is 400697993. The reversal of 400697977 is 779796004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394062201 + 6635776 = 19851^2 + 2576^2 .

It is a cyclic number.

It is not a de Polignac number, because 400697977 - 2⁷ = 400697849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400697977.

It is not a weakly prime, because it can be changed into another prime (400697917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200348988 + 200348989.

It is an arithmetic number, because the mean of its divisors is an integer number (200348989).

Almost surely, 2^400697977 is an apocalyptic number.

It is an amenable number.

400697977 is a deficient number, since it is larger than the sum of its proper divisors (1).

400697977 is an equidigital number, since it uses as much as digits as its factorization.

400697977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 666792, while the sum is 49.

The square root of 400697977 is about 20017.4418195732. The cubic root of 400697977 is about 737.2346122399.

The spelling of 400697977 in words is "four hundred million, six hundred ninety-seven thousand, nine hundred seventy-seven".