18620393 has 4 divisors (see below), whose sum is σ = 20313168. Its totient is φ = 16927620.

The previous prime is 18620387. The next prime is 18620417. The reversal of 18620393 is 39302681.

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 18620393 - 2¹⁴ = 18604009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18620353) 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, 846371 + ... + 846392.

It is an arithmetic number, because the mean of its divisors is an integer number (5078292).

Almost surely, 2^18620393 is an apocalyptic number.

It is an amenable number.

18620393 is a deficient number, since it is larger than the sum of its proper divisors (1692775).

18620393 is a wasteful number, since it uses less digits than its factorization.

18620393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692774.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 18620393 is about 4315.1353397084. The cubic root of 18620393 is about 265.0511020472.

The spelling of 18620393 in words is "eighteen million, six hundred twenty thousand, three hundred ninety-three".