642893 has 4 divisors (see below), whose sum is σ = 657888. Its totient is φ = 627900.

The previous prime is 642881. The next prime is 642899. The reversal of 642893 is 398246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642893 - 2⁴ = 642877 is a prime.

It is a super-2 number, since 2×642893² = 826622818898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7433 + ... + 7518.

It is an arithmetic number, because the mean of its divisors is an integer number (164472).

2⁶⁴²⁸⁹³ is an apocalyptic number.

It is an amenable number.

642893 is a deficient number, since it is larger than the sum of its proper divisors (14995).

642893 is a wasteful number, since it uses less digits than its factorization.

642893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14994.

The product of its digits is 10368, while the sum is 32.

The square root of 642893 is about 801.8060862827. The cubic root of 642893 is about 86.3070420117.

The spelling of 642893 in words is "six hundred forty-two thousand, eight hundred ninety-three".