2939905 has 8 divisors (see below), whose sum is σ = 3614184. Its totient is φ = 2294400.

The previous prime is 2939899. The next prime is 2939917. The reversal of 2939905 is 5099392.

It can be written as a sum of positive squares in 4 ways, for example, as 237169 + 2702736 = 487^2 + 1644^2 .

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

It is not a de Polignac number, because 2939905 - 2⁵ = 2939873 is a prime.

It is an Ulam number.

It is a Duffinian number.

2939905 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6966 + ... + 7375.

It is an arithmetic number, because the mean of its divisors is an integer number (451773).

2^2939905 is an apocalyptic number.

It is an amenable number.

2939905 is a deficient number, since it is larger than the sum of its proper divisors (674279).

2939905 is a wasteful number, since it uses less digits than its factorization.

2939905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14387.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 2939905 is about 1714.6151171619. The cubic root of 2939905 is about 143.2554320992.

It can be divided in two parts, 2939 and 905, that added together give a square (3844 = 62²).

The spelling of 2939905 in words is "two million, nine hundred thirty-nine thousand, nine hundred five".