401863639 has 2 divisors, whose sum is σ = 401863640. Its totient is φ = 401863638.

The previous prime is 401863601. The next prime is 401863703. The reversal of 401863639 is 936368104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401863639 - 2⁹ = 401863127 is a prime.

It is a super-2 number, since 2×401863639² = 322988768700644642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401863339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200931819 + 200931820.

It is an arithmetic number, because the mean of its divisors is an integer number (200931820).

Almost surely, 2^401863639 is an apocalyptic number.

401863639 is a deficient number, since it is larger than the sum of its proper divisors (1).

401863639 is an equidigital number, since it uses as much as digits as its factorization.

401863639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 401863639 is about 20046.5368330792. The cubic root of 401863639 is about 737.9488113329.

The spelling of 401863639 in words is "four hundred one million, eight hundred sixty-three thousand, six hundred thirty-nine".