23642 has 4 divisors (see below), whose sum is σ = 35466. Its totient is φ = 11820.

The previous prime is 23633. The next prime is 23663. The reversal of 23642 is 24632.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22801 + 841 = 151^2 + 29^2 .

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 23642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5909 + ... + 5912.

2²³⁶⁴² is an apocalyptic number.

23642 is a deficient number, since it is larger than the sum of its proper divisors (11824).

23642 is a wasteful number, since it uses less digits than its factorization.

23642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11823.

The product of its digits is 288, while the sum is 17.

The square root of 23642 is about 153.7595525488. The cubic root of 23642 is about 28.7008485951.

Subtracting 23642 from its reverse (24632), we obtain a triangular number (990 = T₄₄).

The spelling of 23642 in words is "twenty-three thousand, six hundred forty-two".