3139921 has 8 divisors (see below), whose sum is σ = 3362400. Its totient is φ = 2923200.

The previous prime is 3139919. The next prime is 3139943. The reversal of 3139921 is 1299313.

3139921 = 35² + 36² + ... + 211².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3139921 - 2¹ = 3139919 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3139921.

It is not an unprimeable number, because it can be changed into a prime (3139901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280 + ... + 2521.

It is an arithmetic number, because the mean of its divisors is an integer number (420300).

Almost surely, 2^3139921 is an apocalyptic number.

3139921 is the 1121-st heptagonal number.

It is an amenable number.

3139921 is a deficient number, since it is larger than the sum of its proper divisors (222479).

3139921 is a wasteful number, since it uses less digits than its factorization.

3139921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879.

The product of its digits is 1458, while the sum is 28.

The square root of 3139921 is about 1771.9822233871. The cubic root of 3139921 is about 146.4332069805.

The spelling of 3139921 in words is "three million, one hundred thirty-nine thousand, nine hundred twenty-one".