2921790 has 48 divisors (see below), whose sum is σ = 7471152. Its totient is φ = 731136.

The previous prime is 2921777. The next prime is 2921819. The reversal of 2921790 is 971292.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8502 + ... + 8838.

It is an arithmetic number, because the mean of its divisors is an integer number (155649).

2^2921790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2921790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3735576).

2921790 is an abundant number, since it is smaller than the sum of its proper divisors (4549362).

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

2921790 is a wasteful number, since it uses less digits than its factorization.

2921790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 2921790 is about 1709.3244279539. The cubic root of 2921790 is about 142.9605903104.

The spelling of 2921790 in words is "two million, nine hundred twenty-one thousand, seven hundred ninety".