23890138 has 4 divisors (see below), whose sum is σ = 35835210. Its totient is φ = 11945068.

The previous prime is 23890133. The next prime is 23890177. The reversal of 23890138 is 83109832.

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., 15784729 + 8105409 = 3973^2 + 2847^2 .

It is not an unprimeable number, because it can be changed into a prime (23890133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5972533 + ... + 5972536.

Almost surely, 2^23890138 is an apocalyptic number.

23890138 is a deficient number, since it is larger than the sum of its proper divisors (11945072).

23890138 is a wasteful number, since it uses less digits than its factorization.

23890138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11945071.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 23890138 is about 4887.7538808741. The cubic root of 23890138 is about 288.0091062578.

The spelling of 23890138 in words is "twenty-three million, eight hundred ninety thousand, one hundred thirty-eight".