18923697 has 12 divisors (see below), whose sum is σ = 29437044. Its totient is φ = 11645280.

The previous prime is 18923651. The next prime is 18923743. The reversal of 18923697 is 79632981.

It is an interprime number because it is at equal distance from previous prime (18923651) and next prime (18923743).

It can be written as a sum of positive squares in 2 ways, for example, as 3549456 + 15374241 = 1884^2 + 3921^2 .

It is not a de Polignac number, because 18923697 - 2⁸ = 18923441 is a prime.

It is a super-3 number, since 3×18923697³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18923617) 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, 80754 + ... + 80987.

It is an arithmetic number, because the mean of its divisors is an integer number (2453087).

Almost surely, 2^18923697 is an apocalyptic number.

It is an amenable number.

18923697 is a deficient number, since it is larger than the sum of its proper divisors (10513347).

18923697 is a wasteful number, since it uses less digits than its factorization.

18923697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161760 (or 161757 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 18923697 is about 4350.1375840311. The cubic root of 18923697 is about 266.4824802772.

The spelling of 18923697 in words is "eighteen million, nine hundred twenty-three thousand, six hundred ninety-seven".