642902 has 16 divisors (see below), whose sum is σ = 1055040. Its totient is φ = 292032.

The previous prime is 642899. The next prime is 642907. The reversal of 642902 is 209246.

642902 is nontrivially palindromic in base 12.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642902.

It is not an unprimeable number, because it can be changed into a prime (642907) 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, 1898 + ... + 2210.

It is an arithmetic number, because the mean of its divisors is an integer number (65940).

2⁶⁴²⁹⁰² is an apocalyptic number.

642902 is a deficient number, since it is larger than the sum of its proper divisors (412138).

642902 is a wasteful number, since it uses less digits than its factorization.

642902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 642902 is about 801.8116985926. The cubic root of 642902 is about 86.3074447536.

The spelling of 642902 in words is "six hundred forty-two thousand, nine hundred two".