2409921 has 12 divisors (see below), whose sum is σ = 3575572. Its totient is φ = 1562976.

The previous prime is 2409907. The next prime is 2409947. The reversal of 2409921 is 1299042.

It can be written as a sum of positive squares in 2 ways, for example, as 1904400 + 505521 = 1380^2 + 711^2 .

It is not a de Polignac number, because 2409921 - 2¹⁴ = 2393537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2402921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3286 + ... + 3951.

2^2409921 is an apocalyptic number.

It is an amenable number.

2409921 is a deficient number, since it is larger than the sum of its proper divisors (1165651).

2409921 is a wasteful number, since it uses less digits than its factorization.

2409921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7280 (or 7277 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 2409921 is about 1552.3920252307. The cubic root of 2409921 is about 134.0708209581.

The spelling of 2409921 in words is "two million, four hundred nine thousand, nine hundred twenty-one".