18988901 has 4 divisors (see below), whose sum is σ = 19020492. Its totient is φ = 18957312.

The previous prime is 18988897. The next prime is 18988919. The reversal of 18988901 is 10988981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10988981 = 239 ⋅45979.

It can be written as a sum of positive squares in 2 ways, for example, as 9928801 + 9060100 = 3151^2 + 3010^2 .

It is a cyclic number.

It is not a de Polignac number, because 18988901 - 2² = 18988897 is a prime.

It is a super-2 number, since 2×18988901² = 721156722375602, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988601) 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, 14876 + ... + 16101.

It is an arithmetic number, because the mean of its divisors is an integer number (4755123).

Almost surely, 2^18988901 is an apocalyptic number.

It is an amenable number.

18988901 is a deficient number, since it is larger than the sum of its proper divisors (31591).

18988901 is an equidigital number, since it uses as much as digits as its factorization.

18988901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31590.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 18988901 is about 4357.6256149422. The cubic root of 18988901 is about 266.7881958219.

The spelling of 18988901 in words is "eighteen million, nine hundred eighty-eight thousand, nine hundred one".