2921920 has 56 divisors (see below), whose sum is σ = 7278624. Its totient is φ = 1115136.

The previous prime is 2921911. The next prime is 2921921. The reversal of 2921920 is 291292.

2921920 = 83² + 84² + ... + 210².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2921921) 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, 7162 + ... + 7558.

2^2921920 is an apocalyptic number.

2921920 is a gapful number since it is divisible by the number (20) 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 2921920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3639312).

2921920 is an abundant number, since it is smaller than the sum of its proper divisors (4356704).

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

2921920 is a wasteful number, since it uses less digits than its factorization.

2921920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2921920 is about 1709.3624542501. The cubic root of 2921920 is about 142.9627105405.

The spelling of 2921920 in words is "two million, nine hundred twenty-one thousand, nine hundred twenty".