390724 has 24 divisors (see below), whose sum is σ = 741888. Its totient is φ = 179520.

The previous prime is 390721. The next prime is 390727. The reversal of 390724 is 427093.

It is an interprime number because it is at equal distance from previous prime (390721) and next prime (390727).

It is not an unprimeable number, because it can be changed into a prime (390721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2784 + ... + 2920.

It is an arithmetic number, because the mean of its divisors is an integer number (30912).

2³⁹⁰⁷²⁴ is an apocalyptic number.

It is an amenable number.

390724 is a deficient number, since it is larger than the sum of its proper divisors (351164).

390724 is a wasteful number, since it uses less digits than its factorization.

390724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 390724 is about 625.0791949825. The cubic root of 390724 is about 73.1066184591.

The spelling of 390724 in words is "three hundred ninety thousand, seven hundred twenty-four".