674978391 has 12 divisors (see below), whose sum is σ = 980417880. Its totient is φ = 447470640.

The previous prime is 674978351. The next prime is 674978411. The reversal of 674978391 is 193879476.

It is a happy number.

674978391 is a `hidden beast` number, since 67 + 497 + 8 + 3 + 91 = 666.

It is not a de Polignac number, because 674978391 - 2¹⁹ = 674454103 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (674978341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207880 + ... + 211101.

It is an arithmetic number, because the mean of its divisors is an integer number (81701490).

Almost surely, 2^674978391 is an apocalyptic number.

674978391 is a deficient number, since it is larger than the sum of its proper divisors (305439489).

674978391 is a wasteful number, since it uses less digits than its factorization.

674978391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419166 (or 419163 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 674978391 is about 25980.3462448059. The cubic root of 674978391 is about 877.1959606085.

The spelling of 674978391 in words is "six hundred seventy-four million, nine hundred seventy-eight thousand, three hundred ninety-one".