390817487 has 2 divisors, whose sum is σ = 390817488. Its totient is φ = 390817486.

The previous prime is 390817477. The next prime is 390817489. The reversal of 390817487 is 784718093.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390817487 is a prime.

Together with 390817489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390817489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195408743 + 195408744.

It is an arithmetic number, because the mean of its divisors is an integer number (195408744).

Almost surely, 2^390817487 is an apocalyptic number.

390817487 is a deficient number, since it is larger than the sum of its proper divisors (1).

390817487 is an equidigital number, since it uses as much as digits as its factorization.

390817487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 390817487 is about 19769.1043550283. The cubic root of 390817487 is about 731.1244863887.

The spelling of 390817487 in words is "three hundred ninety million, eight hundred seventeen thousand, four hundred eighty-seven".