3149721 has 12 divisors (see below), whose sum is σ = 4570020. Its totient is φ = 2090400.

The previous prime is 3149683. The next prime is 3149747. The reversal of 3149721 is 1279413.

It can be written as a sum of positive squares in 2 ways, for example, as 69696 + 3080025 = 264^2 + 1755^2 .

It is not a de Polignac number, because 3149721 - 2¹⁰ = 3148697 is a prime.

It is a Curzon number.

3149721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3149761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1771 + ... + 3071.

It is an arithmetic number, because the mean of its divisors is an integer number (380835).

Almost surely, 2^3149721 is an apocalyptic number.

It is an amenable number.

3149721 is a deficient number, since it is larger than the sum of its proper divisors (1420299).

3149721 is a wasteful number, since it uses less digits than its factorization.

3149721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576 (or 1573 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 3149721 is about 1774.7453338437. The cubic root of 3149721 is about 146.5853928730.

The spelling of 3149721 in words is "three million, one hundred forty-nine thousand, seven hundred twenty-one".