390352993 has 2 divisors, whose sum is σ = 390352994. Its totient is φ = 390352992.

The previous prime is 390352957. The next prime is 390353053. The reversal of 390352993 is 399253093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321413184 + 68939809 = 17928^2 + 8303^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390352993 is a prime.

It is not a weakly prime, because it can be changed into another prime (390352933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195176496 + 195176497.

It is an arithmetic number, because the mean of its divisors is an integer number (195176497).

Almost surely, 2^390352993 is an apocalyptic number.

It is an amenable number.

390352993 is a deficient number, since it is larger than the sum of its proper divisors (1).

390352993 is an equidigital number, since it uses as much as digits as its factorization.

390352993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196830, while the sum is 43.

The square root of 390352993 is about 19757.3528844327. The cubic root of 390352993 is about 730.8347197850.

The spelling of 390352993 in words is "three hundred ninety million, three hundred fifty-two thousand, nine hundred ninety-three".