400626817 has 2 divisors, whose sum is σ = 400626818. Its totient is φ = 400626816.

The previous prime is 400626797. The next prime is 400626823. The reversal of 400626817 is 718626004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354983281 + 45643536 = 18841^2 + 6756^2 .

It is a cyclic number.

It is not a de Polignac number, because 400626817 - 2¹⁹ = 400102529 is a prime.

It is not a weakly prime, because it can be changed into another prime (400626887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200313408 + 200313409.

It is an arithmetic number, because the mean of its divisors is an integer number (200313409).

Almost surely, 2^400626817 is an apocalyptic number.

It is an amenable number.

400626817 is a deficient number, since it is larger than the sum of its proper divisors (1).

400626817 is an equidigital number, since it uses as much as digits as its factorization.

400626817 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 34.

The square root of 400626817 is about 20015.6642907499. The cubic root of 400626817 is about 737.1909677962.

The spelling of 400626817 in words is "four hundred million, six hundred twenty-six thousand, eight hundred seventeen".