18997869 has 8 divisors (see below), whose sum is σ = 27633312. Its totient is φ = 11513840.

The previous prime is 18997843. The next prime is 18997877. The reversal of 18997869 is 96879981.

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 18997869 - 2⁵ = 18997837 is a prime.

It is a super-2 number, since 2×18997869² = 721838053082322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18997819) 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, 287814 + ... + 287879.

It is an arithmetic number, because the mean of its divisors is an integer number (3454164).

Almost surely, 2^18997869 is an apocalyptic number.

It is an amenable number.

18997869 is a deficient number, since it is larger than the sum of its proper divisors (8635443).

18997869 is a wasteful number, since it uses less digits than its factorization.

18997869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575707.

The product of its digits is 1959552, while the sum is 57.

The square root of 18997869 is about 4358.6544942218. The cubic root of 18997869 is about 266.8301884222.

The spelling of 18997869 in words is "eighteen million, nine hundred ninety-seven thousand, eight hundred sixty-nine".