23199391 has 4 divisors (see below), whose sum is σ = 23999400. Its totient is φ = 22399384.

The previous prime is 23199389. The next prime is 23199401. The reversal of 23199391 is 19399132.

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 23199391 - 2¹ = 23199389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23199391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23199091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399961 + ... + 400018.

It is an arithmetic number, because the mean of its divisors is an integer number (5999850).

Almost surely, 2^23199391 is an apocalyptic number.

23199391 is a deficient number, since it is larger than the sum of its proper divisors (800009).

23199391 is an equidigital number, since it uses as much as digits as its factorization.

23199391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800008.

The product of its digits is 13122, while the sum is 37.

The square root of 23199391 is about 4816.5746127305. The cubic root of 23199391 is about 285.2061338311.

The spelling of 23199391 in words is "twenty-three million, one hundred ninety-nine thousand, three hundred ninety-one".