18393641 has 8 divisors (see below), whose sum is σ = 21215040. Its totient is φ = 15620688.

The previous prime is 18393619. The next prime is 18393671. The reversal of 18393641 is 14639381.

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

It is a cyclic number.

It is not a de Polignac number, because 18393641 - 2¹⁴ = 18377257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18393611) 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, 11291 + ... + 12816.

It is an arithmetic number, because the mean of its divisors is an integer number (2651880).

Almost surely, 2^18393641 is an apocalyptic number.

It is an amenable number.

18393641 is a deficient number, since it is larger than the sum of its proper divisors (2821399).

18393641 is a wasteful number, since it uses less digits than its factorization.

18393641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24223.

The product of its digits is 15552, while the sum is 35.

The square root of 18393641 is about 4288.7808290935. The cubic root of 18393641 is about 263.9708081052.

The spelling of 18393641 in words is "eighteen million, three hundred ninety-three thousand, six hundred forty-one".