3129997 has 4 divisors (see below), whose sum is σ = 3370780. Its totient is φ = 2889216.

The previous prime is 3129991. The next prime is 3130007. The reversal of 3129997 is 7999213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7999213 = 107 ⋅74759.

It can be written as a sum of positive squares in 2 ways, for example, as 1798281 + 1331716 = 1341^2 + 1154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3129997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3129991) 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, 120372 + ... + 120397.

It is an arithmetic number, because the mean of its divisors is an integer number (842695).

Almost surely, 2^3129997 is an apocalyptic number.

It is an amenable number.

3129997 is a deficient number, since it is larger than the sum of its proper divisors (240783).

3129997 is a wasteful number, since it uses less digits than its factorization.

3129997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240782.

The product of its digits is 30618, while the sum is 40.

The square root of 3129997 is about 1769.1797534451. The cubic root of 3129997 is about 146.2787724334.

The spelling of 3129997 in words is "three million, one hundred twenty-nine thousand, nine hundred ninety-seven".