2291904 has 84 divisors (see below), whose sum is σ = 6894576. Its totient is φ = 726528.

The previous prime is 2291903. The next prime is 2291909. The reversal of 2291904 is 4091922.

It is not an unprimeable number, because it can be changed into a prime (2291903) 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, 13162 + ... + 13334.

2^2291904 is an apocalyptic number.

2291904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2291904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3447288).

2291904 is an abundant number, since it is smaller than the sum of its proper divisors (4602672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2291904 is a wasteful number, since it uses less digits than its factorization.

2291904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 201 counting only the distinct ones).

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

The square root of 2291904 is about 1513.9035636394. The cubic root of 2291904 is about 131.8455493784.

The spelling of 2291904 in words is "two million, two hundred ninety-one thousand, nine hundred four".