390629 has 4 divisors (see below), whose sum is σ = 391884. Its totient is φ = 389376.

The previous prime is 390581. The next prime is 390647. The reversal of 390629 is 926093.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 926093 = 7 ⋅132299.

It can be written as a sum of positive squares in 2 ways, for example, as 388129 + 2500 = 623^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 390629 - 2⁸ = 390373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239 + ... + 915.

It is an arithmetic number, because the mean of its divisors is an integer number (97971).

2³⁹⁰⁶²⁹ is an apocalyptic number.

It is an amenable number.

390629 is a deficient number, since it is larger than the sum of its proper divisors (1255).

390629 is an equidigital number, since it uses as much as digits as its factorization.

390629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 390629 is about 625.0031999918. The cubic root of 390629 is about 73.1006929707.

The spelling of 390629 in words is "three hundred ninety thousand, six hundred twenty-nine".