18374421 has 8 divisors (see below), whose sum is σ = 26383840. Its totient is φ = 11307312.

The previous prime is 18374417. The next prime is 18374431. The reversal of 18374421 is 12447381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18374421 - 2² = 18374417 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 (18374431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235531 + ... + 235608.

It is an arithmetic number, because the mean of its divisors is an integer number (3297980).

Almost surely, 2^18374421 is an apocalyptic number.

It is an amenable number.

18374421 is a deficient number, since it is larger than the sum of its proper divisors (8009419).

18374421 is a wasteful number, since it uses less digits than its factorization.

18374421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471155.

The product of its digits is 5376, while the sum is 30.

The square root of 18374421 is about 4286.5395134071. The cubic root of 18374421 is about 263.8788327117.

The spelling of 18374421 in words is "eighteen million, three hundred seventy-four thousand, four hundred twenty-one".