390651 has 8 divisors (see below), whose sum is σ = 524304. Its totient is φ = 258720.

The previous prime is 390647. The next prime is 390653. The reversal of 390651 is 156093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 390651 - 2² = 390647 is a prime.

390651 is a lucky 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 7 ways as a sum of consecutive naturals, for example, 261 + ... + 921.

It is an arithmetic number, because the mean of its divisors is an integer number (65538).

2³⁹⁰⁶⁵¹ is an apocalyptic number.

390651 is a deficient number, since it is larger than the sum of its proper divisors (133653).

390651 is a wasteful number, since it uses less digits than its factorization.

390651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 390651 is about 625.0207996539. The cubic root of 390651 is about 73.1020652745.

It can be divided in two parts, 3 and 90651, that multiplied together give a triangular number (271953 = T₇₃₇).

The spelling of 390651 in words is "three hundred ninety thousand, six hundred fifty-one".