18980317 has 4 divisors (see below), whose sum is σ = 19049116. Its totient is φ = 18911520.

The previous prime is 18980309. The next prime is 18980321. The reversal of 18980317 is 71308981.

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 12068676 + 6911641 = 3474^2 + 2629^2 .

It is a cyclic number.

It is not a de Polignac number, because 18980317 - 2³ = 18980309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18980387) 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, 33984 + ... + 34537.

It is an arithmetic number, because the mean of its divisors is an integer number (4762279).

Almost surely, 2^18980317 is an apocalyptic number.

It is an amenable number.

18980317 is a deficient number, since it is larger than the sum of its proper divisors (68799).

18980317 is an equidigital number, since it uses as much as digits as its factorization.

18980317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68798.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 18980317 is about 4356.6405635535. The cubic root of 18980317 is about 266.7479889129.

The spelling of 18980317 in words is "eighteen million, nine hundred eighty thousand, three hundred seventeen".