2421990 has 48 divisors (see below), whose sum is σ = 6671808. Its totient is φ = 607488.

The previous prime is 2421989. The next prime is 2421997. The reversal of 2421990 is 991242.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 739 + ... + 2321.

It is an arithmetic number, because the mean of its divisors is an integer number (138996).

2^2421990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2421990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3335904).

2421990 is an abundant number, since it is smaller than the sum of its proper divisors (4249818).

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

2421990 is a wasteful number, since it uses less digits than its factorization.

2421990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613 (or 1610 counting only the distinct ones).

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

The square root of 2421990 is about 1556.2743973991. The cubic root of 2421990 is about 134.2942594101.

The spelling of 2421990 in words is "two million, four hundred twenty-one thousand, nine hundred ninety".