2389778479 has 4 divisors (see below), whose sum is σ = 2607031080. Its totient is φ = 2172525880.

The previous prime is 2389778471. The next prime is 2389778507. The reversal of 2389778479 is 9748779832.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2389778479 - 2³ = 2389778471 is a prime.

It is a super-2 number, since 2×2389778479² = 11422082357383106882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2389778479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2389778471) 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, 108626284 + ... + 108626305.

It is an arithmetic number, because the mean of its divisors is an integer number (651757770).

Almost surely, 2^2389778479 is an apocalyptic number.

2389778479 is a deficient number, since it is larger than the sum of its proper divisors (217252601).

2389778479 is a wasteful number, since it uses less digits than its factorization.

2389778479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217252600.

The product of its digits is 42674688, while the sum is 64.

The square root of 2389778479 is about 48885.3605796255. The cubic root of 2389778479 is about 1336.9624667821.

It can be divided in two parts, 238977 and 8479, that added together give a triangular number (247456 = T₇₀₃).

The spelling of 2389778479 in words is "two billion, three hundred eighty-nine million, seven hundred seventy-eight thousand, four hundred seventy-nine".