23400391 has 12 divisors (see below), whose sum is σ = 27958728. Its totient is φ = 19513872.

The previous prime is 23400389. The next prime is 23400397. The reversal of 23400391 is 19300432.

It is not a de Polignac number, because 23400391 - 2¹ = 23400389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23400397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4641 + ... + 8266.

It is an arithmetic number, because the mean of its divisors is an integer number (2329894).

Almost surely, 2^23400391 is an apocalyptic number.

23400391 is a deficient number, since it is larger than the sum of its proper divisors (4558337).

23400391 is a wasteful number, since it uses less digits than its factorization.

23400391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12958 (or 12951 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 23400391 is about 4837.3950634613. The cubic root of 23400391 is about 286.0274436964.

The spelling of 23400391 in words is "twenty-three million, four hundred thousand, three hundred ninety-one".