646371 has 12 divisors (see below), whose sum is σ = 1018680. Its totient is φ = 391680.

The previous prime is 646339. The next prime is 646379. The reversal of 646371 is 173646.

It is not a de Polignac number, because 646371 - 2⁵ = 646339 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (646379) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3166 + ... + 3363.

It is an arithmetic number, because the mean of its divisors is an integer number (84890).

2⁶⁴⁶³⁷¹ is an apocalyptic number.

646371 is a deficient number, since it is larger than the sum of its proper divisors (372309).

646371 is a wasteful number, since it uses less digits than its factorization.

646371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6546 (or 6543 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 646371 is about 803.9720144383. The cubic root of 646371 is about 86.4624002667.

The spelling of 646371 in words is "six hundred forty-six thousand, three hundred seventy-one".