3129969 has 4 divisors (see below), whose sum is σ = 4173296. Its totient is φ = 2086644.

The previous prime is 3129967. The next prime is 3129991. The reversal of 3129969 is 9699213.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9699213 = 3 ⋅3233071.

It is not a de Polignac number, because 3129969 - 2¹ = 3129967 is a prime.

It is a super-2 number, since 2×3129969² = 19593411881922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

3129969 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3129961) 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, 521659 + ... + 521664.

It is an arithmetic number, because the mean of its divisors is an integer number (1043324).

Almost surely, 2^3129969 is an apocalyptic number.

It is an amenable number.

3129969 is a deficient number, since it is larger than the sum of its proper divisors (1043327).

3129969 is a wasteful number, since it uses less digits than its factorization.

3129969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043326.

The product of its digits is 26244, while the sum is 39.

The square root of 3129969 is about 1769.1718401557. The cubic root of 3129969 is about 146.2783362437.

The spelling of 3129969 in words is "three million, one hundred twenty-nine thousand, nine hundred sixty-nine".