400451897 has 2 divisors, whose sum is σ = 400451898. Its totient is φ = 400451896.

The previous prime is 400451839. The next prime is 400451899. The reversal of 400451897 is 798154004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311734336 + 88717561 = 17656^2 + 9419^2 .

It is a cyclic number.

It is not a de Polignac number, because 400451897 - 2¹⁸ = 400189753 is a prime.

Together with 400451899, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400451897.

It is not a weakly prime, because it can be changed into another prime (400451899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200225948 + 200225949.

It is an arithmetic number, because the mean of its divisors is an integer number (200225949).

Almost surely, 2^400451897 is an apocalyptic number.

It is an amenable number.

400451897 is a deficient number, since it is larger than the sum of its proper divisors (1).

400451897 is an equidigital number, since it uses as much as digits as its factorization.

400451897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 400451897 is about 20011.2942360058. The cubic root of 400451897 is about 737.0836624352.

The spelling of 400451897 in words is "four hundred million, four hundred fifty-one thousand, eight hundred ninety-seven".