390506929 has 2 divisors, whose sum is σ = 390506930. Its totient is φ = 390506928.

The previous prime is 390506927. The next prime is 390506959. The reversal of 390506929 is 929605093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386712225 + 3794704 = 19665^2 + 1948^2 .

It is an emirp because it is prime and its reverse (929605093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390506929 - 2¹ = 390506927 is a prime.

It is a super-2 number, since 2×390506929² = 304991323194022082, which contains 22 as substring.

Together with 390506927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (390506923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195253464 + 195253465.

It is an arithmetic number, because the mean of its divisors is an integer number (195253465).

Almost surely, 2^390506929 is an apocalyptic number.

It is an amenable number.

390506929 is a deficient number, since it is larger than the sum of its proper divisors (1).

390506929 is an equidigital number, since it uses as much as digits as its factorization.

390506929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 390506929 is about 19761.2481640204. The cubic root of 390506929 is about 730.9307755690.

The spelling of 390506929 in words is "three hundred ninety million, five hundred six thousand, nine hundred twenty-nine".