1980197 has 4 divisors (see below), whose sum is σ = 1987776. Its totient is φ = 1972620.

The previous prime is 1980191. The next prime is 1980221. The reversal of 1980197 is 7910891.

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 a cyclic number.

It is not a de Polignac number, because 1980197 - 2⁸ = 1979941 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 (1980191) 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, 3383 + ... + 3924.

It is an arithmetic number, because the mean of its divisors is an integer number (496944).

2^1980197 is an apocalyptic number.

It is an amenable number.

1980197 is a deficient number, since it is larger than the sum of its proper divisors (7579).

1980197 is an equidigital number, since it uses as much as digits as its factorization.

1980197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7578.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 1980197 is about 1407.1947271078. The cubic root of 1980197 is about 125.5748879772.

The spelling of 1980197 in words is "one million, nine hundred eighty thousand, one hundred ninety-seven".