3991479 has 4 divisors (see below), whose sum is σ = 5321976. Its totient is φ = 2660984.

The previous prime is 3991469. The next prime is 3991511. The reversal of 3991479 is 9741993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9741993 = 3 ⋅3247331.

It is a cyclic number.

It is not a de Polignac number, because 3991479 - 2⁸ = 3991223 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 3991479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991469) 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, 665244 + ... + 665249.

It is an arithmetic number, because the mean of its divisors is an integer number (1330494).

Almost surely, 2^3991479 is an apocalyptic number.

3991479 is a deficient number, since it is larger than the sum of its proper divisors (1330497).

3991479 is a wasteful number, since it uses less digits than its factorization.

3991479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330496.

The product of its digits is 61236, while the sum is 42.

The square root of 3991479 is about 1997.8686142987. The cubic root of 3991479 is about 158.6273063593.

It can be divided in two parts, 39914 and 79, that added together give a palindrome (39993).

The spelling of 3991479 in words is "three million, nine hundred ninety-one thousand, four hundred seventy-nine".