18772117 has 16 divisors (see below), whose sum is σ = 24111360. Its totient is φ = 14205312.

The previous prime is 18772099. The next prime is 18772121. The reversal of 18772117 is 71127781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18772117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2392 + ... + 6577.

It is an arithmetic number, because the mean of its divisors is an integer number (1506960).

Almost surely, 2^18772117 is an apocalyptic number.

It is an amenable number.

18772117 is a deficient number, since it is larger than the sum of its proper divisors (5339243).

18772117 is a wasteful number, since it uses less digits than its factorization.

18772117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9012.

The product of its digits is 5488, while the sum is 34.

The square root of 18772117 is about 4332.6801174331. The cubic root of 18772117 is about 265.7690582269.

Adding to 18772117 its reverse (71127781), we get a palindrome (89899898).

It can be divided in two parts, 18772 and 117, that multiplied together give a square (2196324 = 1482²).

The spelling of 18772117 in words is "eighteen million, seven hundred seventy-two thousand, one hundred seventeen".