289779397 has 4 divisors (see below), whose sum is σ = 299771820. Its totient is φ = 279786976.

The previous prime is 289779383. The next prime is 289779407. The reversal of 289779397 is 793977982.

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 109118916 + 180660481 = 10446^2 + 13441^2 .

It is a cyclic number.

It is not a de Polignac number, because 289779397 - 2¹⁵ = 289746629 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 (289779367) 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, 4996168 + ... + 4996225.

It is an arithmetic number, because the mean of its divisors is an integer number (74942955).

Almost surely, 2^289779397 is an apocalyptic number.

It is an amenable number.

289779397 is a deficient number, since it is larger than the sum of its proper divisors (9992423).

289779397 is an equidigital number, since it uses as much as digits as its factorization.

289779397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9992422.

The product of its digits is 12002256, while the sum is 61.

The square root of 289779397 is about 17022.9080065657. The cubic root of 289779397 is about 661.7427137632.

The spelling of 289779397 in words is "two hundred eighty-nine million, seven hundred seventy-nine thousand, three hundred ninety-seven".