18121757 has 8 divisors (see below), whose sum is σ = 18364416. Its totient is φ = 17880912.

The previous prime is 18121721. The next prime is 18121759. The reversal of 18121757 is 75712181.

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

It is a cyclic number.

It is not a de Polignac number, because 18121757 - 2¹⁰ = 18120733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18121759) 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, 36968 + ... + 37454.

It is an arithmetic number, because the mean of its divisors is an integer number (2295552).

Almost surely, 2^18121757 is an apocalyptic number.

It is an amenable number.

18121757 is a deficient number, since it is larger than the sum of its proper divisors (242659).

18121757 is a wasteful number, since it uses less digits than its factorization.

18121757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907.

The product of its digits is 3920, while the sum is 32.

The square root of 18121757 is about 4256.9657034089. The cubic root of 18121757 is about 262.6637261288.

The spelling of 18121757 in words is "eighteen million, one hundred twenty-one thousand, seven hundred fifty-seven".