2040390 has 80 divisors (see below), whose sum is σ = 6011280. Its totient is φ = 492480.

The previous prime is 2040377. The next prime is 2040403. The reversal of 2040390 is 930402.

It is an interprime number because it is at equal distance from previous prime (2040377) and next prime (2040403).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8796 + ... + 9024.

It is an arithmetic number, because the mean of its divisors is an integer number (75141).

2^2040390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2040390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3005640).

2040390 is an abundant number, since it is smaller than the sum of its proper divisors (3970890).

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

2040390 is a wasteful number, since it uses less digits than its factorization.

2040390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 2040390 is about 1428.4222064922. The cubic root of 2040390 is about 126.8345956745.

Adding to 2040390 its reverse (930402), we get a palindrome (2970792).

The spelling of 2040390 in words is "two million, forty thousand, three hundred ninety".