3129739 has 4 divisors (see below), whose sum is σ = 3145824. Its totient is φ = 3113656.

The previous prime is 3129733. The next prime is 3129757. The reversal of 3129739 is 9379213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9379213 = 433 ⋅21661.

It is a cyclic number.

It is not a de Polignac number, because 3129739 - 2⁷ = 3129611 is a prime.

It is a Duffinian number.

3129739 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3129733) 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, 7747 + ... + 8140.

It is an arithmetic number, because the mean of its divisors is an integer number (786456).

Almost surely, 2^3129739 is an apocalyptic number.

3129739 is a deficient number, since it is larger than the sum of its proper divisors (16085).

3129739 is a wasteful number, since it uses less digits than its factorization.

3129739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16084.

The product of its digits is 10206, while the sum is 34.

The square root of 3129739 is about 1769.1068367965. The cubic root of 3129739 is about 146.2747531580.

The spelling of 3129739 in words is "three million, one hundred twenty-nine thousand, seven hundred thirty-nine".