18934917 has 4 divisors (see below), whose sum is σ = 25246560. Its totient is φ = 12623276.

The previous prime is 18934913. The next prime is 18934933. The reversal of 18934917 is 71943981.

It is a happy number.

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 18934917 - 2² = 18934913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18934913) 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, 3155817 + ... + 3155822.

It is an arithmetic number, because the mean of its divisors is an integer number (6311640).

Almost surely, 2^18934917 is an apocalyptic number.

It is an amenable number.

18934917 is a deficient number, since it is larger than the sum of its proper divisors (6311643).

18934917 is an equidigital number, since it uses as much as digits as its factorization.

18934917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6311642.

The product of its digits is 54432, while the sum is 42.

The square root of 18934917 is about 4351.4270073161. The cubic root of 18934917 is about 266.5351363501.

The spelling of 18934917 in words is "eighteen million, nine hundred thirty-four thousand, nine hundred seventeen".