23218139 has 8 divisors (see below), whose sum is σ = 26569728. Its totient is φ = 19875240.

The previous prime is 23218127. The next prime is 23218147. The reversal of 23218139 is 93181232.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23218139 - 2⁴ = 23218123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23218159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5264 + ... + 8610.

It is an arithmetic number, because the mean of its divisors is an integer number (3321216).

Almost surely, 2^23218139 is an apocalyptic number.

23218139 is a deficient number, since it is larger than the sum of its proper divisors (3351589).

23218139 is an equidigital number, since it uses as much as digits as its factorization.

23218139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4345.

The product of its digits is 2592, while the sum is 29.

The square root of 23218139 is about 4818.5204160613. The cubic root of 23218139 is about 285.2829405152.

The spelling of 23218139 in words is "twenty-three million, two hundred eighteen thousand, one hundred thirty-nine".