2909945 has 8 divisors (see below), whose sum is σ = 3675840. Its totient is φ = 2205360.

The previous prime is 2909923. The next prime is 2909957. The reversal of 2909945 is 5499092.

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

It is not a de Polignac number, because 2909945 - 2⁸ = 2909689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2909899 and 2909908.

It is an unprimeable number.

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, 15221 + ... + 15410.

It is an arithmetic number, because the mean of its divisors is an integer number (459480).

2^2909945 is an apocalyptic number.

It is an amenable number.

2909945 is a deficient number, since it is larger than the sum of its proper divisors (765895).

2909945 is a wasteful number, since it uses less digits than its factorization.

2909945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30655.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 2909945 is about 1705.8560900615. The cubic root of 2909945 is about 142.7671402133.

The spelling of 2909945 in words is "two million, nine hundred nine thousand, nine hundred forty-five".