23120391 has 16 divisors (see below), whose sum is σ = 37304064. Its totient is φ = 12434304.

The previous prime is 23120387. The next prime is 23120393. The reversal of 23120391 is 19302132.

It is a happy number.

It is not a de Polignac number, because 23120391 - 2² = 23120387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23120393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32025 + ... + 32738.

It is an arithmetic number, because the mean of its divisors is an integer number (2331504).

Almost surely, 2^23120391 is an apocalyptic number.

23120391 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23120391 is a deficient number, since it is larger than the sum of its proper divisors (14183673).

23120391 is a wasteful number, since it uses less digits than its factorization.

23120391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64790.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 23120391 is about 4808.3667705365. The cubic root of 23120391 is about 284.8820318171.

The spelling of 23120391 in words is "twenty-three million, one hundred twenty thousand, three hundred ninety-one".