23409391 has 4 divisors (see below), whose sum is σ = 24786432. Its totient is φ = 22032352.

The previous prime is 23409383. The next prime is 23409427. The reversal of 23409391 is 19390432.

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 23409391 - 2³ = 23409383 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23409361) 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, 688495 + ... + 688528.

It is an arithmetic number, because the mean of its divisors is an integer number (6196608).

Almost surely, 2^23409391 is an apocalyptic number.

23409391 is a deficient number, since it is larger than the sum of its proper divisors (1377041).

23409391 is a wasteful number, since it uses less digits than its factorization.

23409391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377040.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 23409391 is about 4838.3252267701. The cubic root of 23409391 is about 286.0641085686.

The spelling of 23409391 in words is "twenty-three million, four hundred nine thousand, three hundred ninety-one".