3139905 has 8 divisors (see below), whose sum is σ = 5023872. Its totient is φ = 1674608.

The previous prime is 3139901. The next prime is 3139907. The reversal of 3139905 is 5099313.

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 3139905 - 2² = 3139901 is a prime.

3139905 is a lucky number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104649 + ... + 104678.

It is an arithmetic number, because the mean of its divisors is an integer number (627984).

Almost surely, 2^3139905 is an apocalyptic number.

It is an amenable number.

3139905 is a deficient number, since it is larger than the sum of its proper divisors (1883967).

3139905 is a wasteful number, since it uses less digits than its factorization.

3139905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209335.

The product of its (nonzero) digits is 3645, while the sum is 30.

The square root of 3139905 is about 1771.9777086634. The cubic root of 3139905 is about 146.4329582550.

Subtracting from 3139905 its product of nonzero digits (3645), we obtain a triangular number (3136260 = T₂₅₀₄).

The spelling of 3139905 in words is "three million, one hundred thirty-nine thousand, nine hundred five".