400997 has 2 divisors, whose sum is σ = 400998. Its totient is φ = 400996.

The previous prime is 400963. The next prime is 401017. The reversal of 400997 is 799004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261121 + 139876 = 511^2 + 374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200498 + 200499.

It is an arithmetic number, because the mean of its divisors is an integer number (200499).

2⁴⁰⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

400997 is a deficient number, since it is larger than the sum of its proper divisors (1).

400997 is an equidigital number, since it uses as much as digits as its factorization.

400997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 400997 is about 633.2432392059. The cubic root of 400997 is about 73.7417955060.

The spelling of 400997 in words is "four hundred thousand, nine hundred ninety-seven".