390942493 has 2 divisors, whose sum is σ = 390942494. Its totient is φ = 390942492.

The previous prime is 390942479. The next prime is 390942511. The reversal of 390942493 is 394249093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305620324 + 85322169 = 17482^2 + 9237^2 .

It is a cyclic number.

It is not a de Polignac number, because 390942493 - 2⁹ = 390941981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390942413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195471246 + 195471247.

It is an arithmetic number, because the mean of its divisors is an integer number (195471247).

Almost surely, 2^390942493 is an apocalyptic number.

It is an amenable number.

390942493 is a deficient number, since it is larger than the sum of its proper divisors (1).

390942493 is an equidigital number, since it uses as much as digits as its factorization.

390942493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 390942493 is about 19772.2657528165. The cubic root of 390942493 is about 731.2024300221.

The spelling of 390942493 in words is "three hundred ninety million, nine hundred forty-two thousand, four hundred ninety-three".