2921880 has 64 divisors (see below), whose sum is σ = 9444960. Its totient is φ = 718848.

The previous prime is 2921879. The next prime is 2921881. The reversal of 2921880 is 881292.

It is an interprime number because it is at equal distance from previous prime (2921879) and next prime (2921881).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2921881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624 + ... + 2496.

2^2921880 is an apocalyptic number.

2921880 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 2921880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4722480).

2921880 is an abundant number, since it is smaller than the sum of its proper divisors (6523080).

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

2921880 is a wasteful number, since it uses less digits than its factorization.

2921880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900 (or 1896 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 2921880 is about 1709.3507539414. The cubic root of 2921880 is about 142.9620581687.

The spelling of 2921880 in words is "two million, nine hundred twenty-one thousand, eight hundred eighty".