642994 has 12 divisors (see below), whose sum is σ = 1060542. Its totient is φ = 292160.

The previous prime is 642977. The next prime is 642997. The reversal of 642994 is 499246.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 131769 = 715^2 + 363^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1087 + ... + 1570.

2⁶⁴²⁹⁹⁴ is an apocalyptic number.

642994 is a deficient number, since it is larger than the sum of its proper divisors (417548).

642994 is a wasteful number, since it uses less digits than its factorization.

642994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681 (or 2670 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 642994 is about 801.8690666187. The cubic root of 642994 is about 86.3115614547.

The spelling of 642994 in words is "six hundred forty-two thousand, nine hundred ninety-four".