390641287 has 2 divisors, whose sum is σ = 390641288. Its totient is φ = 390641286.

The previous prime is 390641267. The next prime is 390641327. The reversal of 390641287 is 782146093.

It is an a-pointer prime, because the next prime (390641327) can be obtained adding 390641287 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 390641287 - 2²³ = 382252679 is a prime.

It is a super-3 number, since 3×390641287³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390641257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195320643 + 195320644.

It is an arithmetic number, because the mean of its divisors is an integer number (195320644).

Almost surely, 2^390641287 is an apocalyptic number.

390641287 is a deficient number, since it is larger than the sum of its proper divisors (1).

390641287 is an equidigital number, since it uses as much as digits as its factorization.

390641287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 390641287 is about 19764.6474038876. The cubic root of 390641287 is about 731.0145940871.

The spelling of 390641287 in words is "three hundred ninety million, six hundred forty-one thousand, two hundred eighty-seven".