18863897 has 12 divisors (see below), whose sum is σ = 21584556. Its totient is φ = 16385280.

The previous prime is 18863879. The next prime is 18863909. The reversal of 18863897 is 79836881.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2062096 + 16801801 = 1436^2 + 4099^2 .

It is not a de Polignac number, because 18863897 - 2⁸ = 18863641 is a prime.

It is a super-2 number, since 2×18863897² = 711693220053218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18863297) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1247 + ... + 6267.

It is an arithmetic number, because the mean of its divisors is an integer number (1798713).

Almost surely, 2^18863897 is an apocalyptic number.

18863897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18863897 is a deficient number, since it is larger than the sum of its proper divisors (2720659).

18863897 is a wasteful number, since it uses less digits than its factorization.

18863897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5068 (or 5051 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 18863897 is about 4343.2587995651. The cubic root of 18863897 is about 266.2014839561.

The spelling of 18863897 in words is "eighteen million, eight hundred sixty-three thousand, eight hundred ninety-seven".