197977 has 8 divisors (see below), whose sum is σ = 216776. Its totient is φ = 179712.

The previous prime is 197971. The next prime is 198013. The reversal of 197977 is 779791.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 841 + 197136 = 29^2 + 444^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 197977 - 2³ = 197969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1183 + ... + 1339.

It is an arithmetic number, because the mean of its divisors is an integer number (27097).

2¹⁹⁷⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

197977 is a deficient number, since it is larger than the sum of its proper divisors (18799).

197977 is a wasteful number, since it uses less digits than its factorization.

197977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267.

The product of its digits is 27783, while the sum is 40.

The square root of 197977 is about 444.9460641471. The cubic root of 197977 is about 58.2825099276.

The spelling of 197977 in words is "one hundred ninety-seven thousand, nine hundred seventy-seven".