3157649 has 4 divisors (see below), whose sum is σ = 3444720. Its totient is φ = 2870580.

The previous prime is 3157639. The next prime is 3157657. The reversal of 3157649 is 9467513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3157649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3157639) 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, 143519 + ... + 143540.

It is an arithmetic number, because the mean of its divisors is an integer number (861180).

Almost surely, 2^3157649 is an apocalyptic number.

It is an amenable number.

3157649 is a deficient number, since it is larger than the sum of its proper divisors (287071).

3157649 is a wasteful number, since it uses less digits than its factorization.

3157649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287070.

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

The square root of 3157649 is about 1776.9774900094. The cubic root of 3157649 is about 146.7082773350.

The spelling of 3157649 in words is "three million, one hundred fifty-seven thousand, six hundred forty-nine".