18980197 has 4 divisors (see below), whose sum is σ = 19125216. Its totient is φ = 18835180.

The previous prime is 18980167. The next prime is 18980231. The reversal of 18980197 is 79108981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18980197 - 2¹⁵ = 18947429 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 (18980167) 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, 72313 + ... + 72574.

It is an arithmetic number, because the mean of its divisors is an integer number (4781304).

Almost surely, 2^18980197 is an apocalyptic number.

It is an amenable number.

18980197 is a deficient number, since it is larger than the sum of its proper divisors (145019).

18980197 is a wasteful number, since it uses less digits than its factorization.

18980197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145018.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 18980197 is about 4356.6267914523. The cubic root of 18980197 is about 266.7474267546.

The spelling of 18980197 in words is "eighteen million, nine hundred eighty thousand, one hundred ninety-seven".