390631663 has 2 divisors, whose sum is σ = 390631664. Its totient is φ = 390631662.

The previous prime is 390631643. The next prime is 390631667. The reversal of 390631663 is 366136093.

It is a strong prime.

It is an emirp because it is prime and its reverse (366136093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390631663 - 2²¹ = 388534511 is a prime.

It is a super-2 number, since 2×390631663² = 305186192276291138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390631667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195315831 + 195315832.

It is an arithmetic number, because the mean of its divisors is an integer number (195315832).

Almost surely, 2^390631663 is an apocalyptic number.

390631663 is a deficient number, since it is larger than the sum of its proper divisors (1).

390631663 is an equidigital number, since it uses as much as digits as its factorization.

390631663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 37.

The square root of 390631663 is about 19764.4039373820. The cubic root of 390631663 is about 731.0085908454.

The spelling of 390631663 in words is "three hundred ninety million, six hundred thirty-one thousand, six hundred sixty-three".