391874674 has 4 divisors (see below), whose sum is σ = 587812014. Its totient is φ = 195937336.

The previous prime is 391874671. The next prime is 391874683. The reversal of 391874674 is 476478193.

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., 333245025 + 58629649 = 18255^2 + 7657^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (391874671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97968667 + ... + 97968670.

Almost surely, 2^391874674 is an apocalyptic number.

391874674 is a deficient number, since it is larger than the sum of its proper divisors (195937340).

391874674 is a wasteful number, since it uses less digits than its factorization.

391874674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195937339.

The product of its digits is 1016064, while the sum is 49.

The square root of 391874674 is about 19795.8246607713. The cubic root of 391874674 is about 731.7831394485.

The spelling of 391874674 in words is "three hundred ninety-one million, eight hundred seventy-four thousand, six hundred seventy-four".