642922 has 16 divisors (see below), whose sum is σ = 1160640. Its totient is φ = 260928.

The previous prime is 642907. The next prime is 642931. The reversal of 642922 is 229246.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 943 + ... + 1474.

It is an arithmetic number, because the mean of its divisors is an integer number (72540).

2⁶⁴²⁹²² is an apocalyptic number.

642922 is a deficient number, since it is larger than the sum of its proper divisors (517718).

642922 is a wasteful number, since it uses less digits than its factorization.

642922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445.

The product of its digits is 1728, while the sum is 25.

The square root of 642922 is about 801.8241702518. The cubic root of 642922 is about 86.3083397220.

The spelling of 642922 in words is "six hundred forty-two thousand, nine hundred twenty-two".