23138157 has 16 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 12971712.

The previous prime is 23138123. The next prime is 23138197. The reversal of 23138157 is 75183132.

It is not a de Polignac number, because 23138157 - 2¹² = 23134061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23138107) 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 15 ways as a sum of consecutive naturals, for example, 9282 + ... + 11507.

It is an arithmetic number, because the mean of its divisors is an integer number (2245320).

Almost surely, 2^23138157 is an apocalyptic number.

It is an amenable number.

23138157 is a deficient number, since it is larger than the sum of its proper divisors (12786963).

23138157 is a wasteful number, since it uses less digits than its factorization.

23138157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20852.

The product of its digits is 5040, while the sum is 30.

The square root of 23138157 is about 4810.2138206113. The cubic root of 23138157 is about 284.9549821169.

The spelling of 23138157 in words is "twenty-three million, one hundred thirty-eight thousand, one hundred fifty-seven".