401890637 has 2 divisors, whose sum is σ = 401890638. Its totient is φ = 401890636.

The previous prime is 401890597. The next prime is 401890669. The reversal of 401890637 is 736098104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210511081 + 191379556 = 14509^2 + 13834^2 .

It is a cyclic number.

It is not a de Polignac number, because 401890637 - 2¹⁰ = 401889613 is a prime.

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 401890637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401890537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200945318 + 200945319.

It is an arithmetic number, because the mean of its divisors is an integer number (200945319).

Almost surely, 2^401890637 is an apocalyptic number.

It is an amenable number.

401890637 is a deficient number, since it is larger than the sum of its proper divisors (1).

401890637 is an equidigital number, since it uses as much as digits as its factorization.

401890637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 401890637 is about 20047.2102049138. The cubic root of 401890637 is about 737.9653365867.

The spelling of 401890637 in words is "four hundred one million, eight hundred ninety thousand, six hundred thirty-seven".