391474 has 4 divisors (see below), whose sum is σ = 587214. Its totient is φ = 195736.

The previous prime is 391453. The next prime is 391487. The reversal of 391474 is 474193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 474193 = 173 ⋅2741.

It can be written as a sum of positive squares in only one way, i.e., 310249 + 81225 = 557^2 + 285^2 .

It is a super-3 number, since 3×391474³ = 179982394300333272, which contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97867 + ... + 97870.

2³⁹¹⁴⁷⁴ is an apocalyptic number.

391474 is a deficient number, since it is larger than the sum of its proper divisors (195740).

391474 is a wasteful number, since it uses less digits than its factorization.

391474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195739.

The product of its digits is 3024, while the sum is 28.

The square root of 391474 is about 625.6788313504. The cubic root of 391474 is about 73.1533649425.

The spelling of 391474 in words is "three hundred ninety-one thousand, four hundred seventy-four".