23138442 has 12 divisors (see below), whose sum is σ = 50133330. Its totient is φ = 7712808.

The previous prime is 23138419. The next prime is 23138461. The reversal of 23138442 is 24483132.

It can be written as a sum of positive squares in only one way, i.e., 21818241 + 1320201 = 4671^2 + 1149^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 642717 + ... + 642752.

Almost surely, 2^23138442 is an apocalyptic number.

23138442 is an abundant number, since it is smaller than the sum of its proper divisors (26994888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23138442 is a wasteful number, since it uses less digits than its factorization.

23138442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285477 (or 1285474 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 23138442 is about 4810.2434449828. The cubic root of 23138442 is about 284.9561520723.

The spelling of 23138442 in words is "twenty-three million, one hundred thirty-eight thousand, four hundred forty-two".