390739 has 2 divisors, whose sum is σ = 390740. Its totient is φ = 390738.

The previous prime is 390737. The next prime is 390743. The reversal of 390739 is 937093.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 390739 - 2¹ = 390737 is a prime.

It is a super-2 number, since 2×390739² = 305353932242, which contains 22 as substring.

Together with 390737, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 390739.

It is not a weakly prime, because it can be changed into another prime (390737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195369 + 195370.

It is an arithmetic number, because the mean of its divisors is an integer number (195370).

2³⁹⁰⁷³⁹ is an apocalyptic number.

390739 is a deficient number, since it is larger than the sum of its proper divisors (1).

390739 is an equidigital number, since it uses as much as digits as its factorization.

390739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 31.

The square root of 390739 is about 625.0911933470. The cubic root of 390739 is about 73.1075539748.

The spelling of 390739 in words is "three hundred ninety thousand, seven hundred thirty-nine".