18797013 has 6 divisors (see below), whose sum is σ = 27151254. Its totient is φ = 12531336.

The previous prime is 18796993. The next prime is 18797021. The reversal of 18797013 is 31079781.

It can be written as a sum of positive squares in only one way, i.e., 14311089 + 4485924 = 3783^2 + 2118^2 .

It is not a de Polignac number, because 18797013 - 2⁶ = 18796949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18797083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1044270 + ... + 1044287.

It is an arithmetic number, because the mean of its divisors is an integer number (4525209).

Almost surely, 2^18797013 is an apocalyptic number.

It is an amenable number.

18797013 is a deficient number, since it is larger than the sum of its proper divisors (8354241).

18797013 is a wasteful number, since it uses less digits than its factorization.

18797013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088563 (or 2088560 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 18797013 is about 4335.5522139631. The cubic root of 18797013 is about 265.8864959424.

The spelling of 18797013 in words is "eighteen million, seven hundred ninety-seven thousand, thirteen".