390655 has 16 divisors (see below), whose sum is σ = 506880. Its totient is φ = 288288.

The previous prime is 390653. The next prime is 390671. The reversal of 390655 is 556093.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 390655 - 2¹ = 390653 is a prime.

It is a super-2 number, since 2×390655² = 305222658050, which contains 22 as substring.

It is a zygodrome in base 4.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4906 + ... + 4984.

It is an arithmetic number, because the mean of its divisors is an integer number (31680).

390655 is a Friedman number, since it can be written as 6*5+5^(9-3^0), using all its digits and the basic arithmetic operations.

2³⁹⁰⁶⁵⁵ is an apocalyptic number.

390655 is a deficient number, since it is larger than the sum of its proper divisors (116225).

390655 is a wasteful number, since it uses less digits than its factorization.

390655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 390655 is about 625.0239995392. The cubic root of 390655 is about 73.1023147788.

The spelling of 390655 in words is "three hundred ninety thousand, six hundred fifty-five".