390730 has 16 divisors (see below), whose sum is σ = 721224. Its totient is φ = 152320.

The previous prime is 390727. The next prime is 390737. The reversal of 390730 is 37093.

390730 = T₄₄₀ + T₄₄₁ + ... + T₄₄₃.

It can be written as a sum of positive squares in 4 ways, for example, as 194481 + 196249 = 441^2 + 443^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67 + ... + 886.

2³⁹⁰⁷³⁰ is an apocalyptic number.

390730 is a deficient number, since it is larger than the sum of its proper divisors (330494).

390730 is a wasteful number, since it uses less digits than its factorization.

390730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001.

The product of its (nonzero) digits is 567, while the sum is 22.

The square root of 390730 is about 625.0839943560. The cubic root of 390730 is about 73.1069926683.

The spelling of 390730 in words is "three hundred ninety thousand, seven hundred thirty".