18111957 has 16 divisors (see below), whose sum is σ = 24665088. Its totient is φ = 11819520.

The previous prime is 18111949. The next prime is 18112001. The reversal of 18111957 is 75911181.

It is not a de Polignac number, because 18111957 - 2³ = 18111949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18111917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41613 + ... + 42045.

It is an arithmetic number, because the mean of its divisors is an integer number (1541568).

Almost surely, 2^18111957 is an apocalyptic number.

It is an amenable number.

18111957 is a deficient number, since it is larger than the sum of its proper divisors (6553131).

18111957 is a wasteful number, since it uses less digits than its factorization.

18111957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700.

The product of its digits is 2520, while the sum is 33.

The square root of 18111957 is about 4255.8144931376. The cubic root of 18111957 is about 262.6163692662.

The spelling of 18111957 in words is "eighteen million, one hundred eleven thousand, nine hundred fifty-seven".