23928138 has 48 divisors (see below), whose sum is σ = 56183400. Its totient is φ = 7316352.

The previous prime is 23928137. The next prime is 23928173. The reversal of 23928138 is 83182932.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23068809 + 859329 = 4803^2 + 927^2 .

It is not an unprimeable number, because it can be changed into a prime (23928137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68388 + ... + 68736.

Almost surely, 2^23928138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23928138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28091700).

23928138 is an abundant number, since it is smaller than the sum of its proper divisors (32255262).

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

23928138 is a wasteful number, since it uses less digits than its factorization.

23928138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 660 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 23928138 is about 4891.6396024237. The cubic root of 23928138 is about 288.1617291856.

The spelling of 23928138 in words is "twenty-three million, nine hundred twenty-eight thousand, one hundred thirty-eight".