3156749 has 4 divisors (see below), whose sum is σ = 3185820. Its totient is φ = 3127680.

The previous prime is 3156743. The next prime is 3156763. The reversal of 3156749 is 9476513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9476513 = 673 ⋅14081.

It can be written as a sum of positive squares in 2 ways, for example, as 2656900 + 499849 = 1630^2 + 707^2 .

It is a cyclic number.

It is not a de Polignac number, because 3156749 - 2⁸ = 3156493 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3156743) 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, 14372 + ... + 14589.

It is an arithmetic number, because the mean of its divisors is an integer number (796455).

Almost surely, 2^3156749 is an apocalyptic number.

It is an amenable number.

3156749 is a deficient number, since it is larger than the sum of its proper divisors (29071).

3156749 is a wasteful number, since it uses less digits than its factorization.

3156749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29070.

The product of its digits is 22680, while the sum is 35.

The square root of 3156749 is about 1776.7242329636. The cubic root of 3156749 is about 146.6943376395.

The spelling of 3156749 in words is "three million, one hundred fifty-six thousand, seven hundred forty-nine".