371989 has 4 divisors (see below), whose sum is σ = 373324. Its totient is φ = 370656.

The previous prime is 371981. The next prime is 371999. The reversal of 371989 is 989173.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 116964 + 255025 = 342^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 371989 - 2³ = 371981 is a prime.

It is a super-2 number, since 2×371989² = 276751632242, which contains 22 as substring.

It is a Duffinian number.

371989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (371981) 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, 72 + ... + 865.

It is an arithmetic number, because the mean of its divisors is an integer number (93331).

2³⁷¹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

371989 is a deficient number, since it is larger than the sum of its proper divisors (1335).

371989 is an equidigital number, since it uses as much as digits as its factorization.

371989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334.

The product of its digits is 13608, while the sum is 37.

The square root of 371989 is about 609.9090096072. The cubic root of 371989 is about 71.9189545889.

The spelling of 371989 in words is "three hundred seventy-one thousand, nine hundred eighty-nine".