2389778 has 4 divisors (see below), whose sum is σ = 3584670. Its totient is φ = 1194888.

The previous prime is 2389757. The next prime is 2389781. The reversal of 2389778 is 8779832.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1760929 + 628849 = 1327^2 + 793^2 .

It is a super-2 number, since 2×2389778² = 11422077778568, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 597443 + ... + 597446.

2^2389778 is an apocalyptic number.

2389778 is a deficient number, since it is larger than the sum of its proper divisors (1194892).

2389778 is a wasteful number, since it uses less digits than its factorization.

2389778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194891.

The product of its digits is 169344, while the sum is 44.

The square root of 2389778 is about 1545.8906817754. The cubic root of 2389778 is about 133.6962377457.

The spelling of 2389778 in words is "two million, three hundred eighty-nine thousand, seven hundred seventy-eight".