18746897 has 4 divisors (see below), whose sum is σ = 20188980. Its totient is φ = 17304816.

The previous prime is 18746891. The next prime is 18746929. The reversal of 18746897 is 79864781.

18746897 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7349521 + 11397376 = 2711^2 + 3376^2 .

It is a cyclic number.

It is not a de Polignac number, because 18746897 - 2⁸ = 18746641 is a prime.

It is a super-2 number, since 2×18746897² = 702892294257218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18746891) 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, 721022 + ... + 721047.

It is an arithmetic number, because the mean of its divisors is an integer number (5047245).

Almost surely, 2^18746897 is an apocalyptic number.

It is an amenable number.

18746897 is a deficient number, since it is larger than the sum of its proper divisors (1442083).

18746897 is a wasteful number, since it uses less digits than its factorization.

18746897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442082.

The product of its digits is 677376, while the sum is 50.

The square root of 18746897 is about 4329.7687005197. The cubic root of 18746897 is about 265.6499862447.

The spelling of 18746897 in words is "eighteen million, seven hundred forty-six thousand, eight hundred ninety-seven".