18423401 has 4 divisors (see below), whose sum is σ = 18536592. Its totient is φ = 18310212.

The previous prime is 18423341. The next prime is 18423421. The reversal of 18423401 is 10432481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18423401 - 2⁶ = 18423337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18423421) 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, 56351 + ... + 56676.

It is an arithmetic number, because the mean of its divisors is an integer number (4634148).

Almost surely, 2^18423401 is an apocalyptic number.

It is an amenable number.

18423401 is a deficient number, since it is larger than the sum of its proper divisors (113191).

18423401 is a wasteful number, since it uses less digits than its factorization.

18423401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113190.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18423401 is about 4292.2489443181. The cubic root of 18423401 is about 264.1130952921.

Adding to 18423401 its reverse (10432481), we get a palindrome (28855882).

The spelling of 18423401 in words is "eighteen million, four hundred twenty-three thousand, four hundred one".