390658 has 4 divisors (see below), whose sum is σ = 585990. Its totient is φ = 195328.

The previous prime is 390653. The next prime is 390671. The reversal of 390658 is 856093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 856093 = 7 ⋅122299.

It can be written as a sum of positive squares in only one way, i.e., 321489 + 69169 = 567^2 + 263^2 .

It is a super-2 number, since 2×390658² = 305227345928, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390653) by changing a digit.

390658 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97663 + ... + 97666.

390658 is a Friedman number, since it can be written as 6+5^8+9*(3+0), using all its digits and the basic arithmetic operations.

2³⁹⁰⁶⁵⁸ is an apocalyptic number.

390658 is a deficient number, since it is larger than the sum of its proper divisors (195332).

390658 is a wasteful number, since it uses less digits than its factorization.

390658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195331.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 390658 is about 625.0263994425. The cubic root of 390658 is about 73.1025019058.

The spelling of 390658 in words is "three hundred ninety thousand, six hundred fifty-eight".