23428391 has 4 divisors (see below), whose sum is σ = 26775312. Its totient is φ = 20081472.

The previous prime is 23428381. The next prime is 23428409. The reversal of 23428391 is 19382432.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23428391 - 2¹⁴ = 23412007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23428381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1673450 + ... + 1673463.

It is an arithmetic number, because the mean of its divisors is an integer number (6693828).

Almost surely, 2^23428391 is an apocalyptic number.

23428391 is a deficient number, since it is larger than the sum of its proper divisors (3346921).

23428391 is an equidigital number, since it uses as much as digits as its factorization.

23428391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346920.

The product of its digits is 10368, while the sum is 32.

The square root of 23428391 is about 4840.2883178588. The cubic root of 23428391 is about 286.1414813382.

The spelling of 23428391 in words is "twenty-three million, four hundred twenty-eight thousand, three hundred ninety-one".