3991474 has 8 divisors (see below), whose sum is σ = 6085548. Its totient is φ = 1962960.

The previous prime is 3991469. The next prime is 3991511. The reversal of 3991474 is 4741993.

It can be written as a sum of positive squares in 2 ways, for example, as 3980025 + 11449 = 1995^2 + 107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16237 + ... + 16480.

Almost surely, 2^3991474 is an apocalyptic number.

3991474 is a deficient number, since it is larger than the sum of its proper divisors (2094074).

3991474 is a wasteful number, since it uses less digits than its factorization.

3991474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32780.

The product of its digits is 27216, while the sum is 37.

The square root of 3991474 is about 1997.8673629648. The cubic root of 3991474 is about 158.6272401234.

It can be divided in two parts, 3991 and 474, that added together give a triangular number (4465 = T₉₄).

The spelling of 3991474 in words is "three million, nine hundred ninety-one thousand, four hundred seventy-four".