674978839 has 4 divisors (see below), whose sum is σ = 676662480. Its totient is φ = 673295200.

The previous prime is 674978831. The next prime is 674978851. The reversal of 674978839 is 938879476.

674978839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 674978839 - 2³ = 674978831 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 (674978831) 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, 841219 + ... + 842020.

It is an arithmetic number, because the mean of its divisors is an integer number (169165620).

Almost surely, 2^674978839 is an apocalyptic number.

674978839 is a deficient number, since it is larger than the sum of its proper divisors (1683641).

674978839 is a wasteful number, since it uses less digits than its factorization.

674978839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683640.

The product of its digits is 18289152, while the sum is 61.

The square root of 674978839 is about 25980.3548667065. The cubic root of 674978839 is about 877.1961546808.

The spelling of 674978839 in words is "six hundred seventy-four million, nine hundred seventy-eight thousand, eight hundred thirty-nine".