2908921 has 8 divisors (see below), whose sum is σ = 3105000. Its totient is φ = 2715648.

The previous prime is 2908891. The next prime is 2908931. The reversal of 2908921 is 1298092.

It can be written as a sum of positive squares in 4 ways, for example, as 765625 + 2143296 = 875^2 + 1464^2 .

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

It is not a de Polignac number, because 2908921 - 2⁵ = 2908889 is a prime.

It is a Duffinian number.

2908921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2908931) 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, 1705 + ... + 2953.

It is an arithmetic number, because the mean of its divisors is an integer number (388125).

2^2908921 is an apocalyptic number.

It is an amenable number.

2908921 is a deficient number, since it is larger than the sum of its proper divisors (196079).

2908921 is a wasteful number, since it uses less digits than its factorization.

2908921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2908921 is about 1705.5559211002. Note that the first 3 decimals coincide. The cubic root of 2908921 is about 142.7503918208.

The spelling of 2908921 in words is "two million, nine hundred eight thousand, nine hundred twenty-one".