400626917 has 2 divisors, whose sum is σ = 400626918. Its totient is φ = 400626916.

The previous prime is 400626907. The next prime is 400626953. The reversal of 400626917 is 719626004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398760961 + 1865956 = 19969^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 400626917 - 2¹² = 400622821 is a prime.

It is equal to p_21367880 and since 400626917 and 21367880 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400626907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200313458 + 200313459.

It is an arithmetic number, because the mean of its divisors is an integer number (200313459).

Almost surely, 2^400626917 is an apocalyptic number.

It is an amenable number.

400626917 is a deficient number, since it is larger than the sum of its proper divisors (1).

400626917 is an equidigital number, since it uses as much as digits as its factorization.

400626917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 400626917 is about 20015.6667887932. Note that the first 3 decimals coincide. The cubic root of 400626917 is about 737.1910291327.

The spelling of 400626917 in words is "four hundred million, six hundred twenty-six thousand, nine hundred seventeen".