18011857 has 8 divisors (see below), whose sum is σ = 19478016. Its totient is φ = 16590912.

The previous prime is 18011849. The next prime is 18011863. The reversal of 18011857 is 75811081.

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

It is not a de Polignac number, because 18011857 - 2³ = 18011849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18011887) 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, 10473 + ... + 12070.

It is an arithmetic number, because the mean of its divisors is an integer number (2434752).

Almost surely, 2^18011857 is an apocalyptic number.

18011857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18011857 is a deficient number, since it is larger than the sum of its proper divisors (1466159).

18011857 is a wasteful number, since it uses less digits than its factorization.

18011857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22607.

The product of its (nonzero) digits is 2240, while the sum is 31.

The square root of 18011857 is about 4244.0378179276. The cubic root of 18011857 is about 262.1316714767.

The spelling of 18011857 in words is "eighteen million, eleven thousand, eight hundred fifty-seven".