2100390 has 32 divisors (see below), whose sum is σ = 5139936. Its totient is φ = 549120.

The previous prime is 2100377. The next prime is 2100403. The reversal of 2100390 is 930012.

It is an interprime number because it is at equal distance from previous prime (2100377) and next prime (2100403).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 930 + ... + 2250.

It is an arithmetic number, because the mean of its divisors is an integer number (160623).

2^2100390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2100390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2569968).

2100390 is an abundant number, since it is smaller than the sum of its proper divisors (3039546).

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

2100390 is a wasteful number, since it uses less digits than its factorization.

2100390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 2100390 is about 1449.2722311560. The cubic root of 2100390 is about 128.0658434029.

The spelling of 2100390 in words is "two million, one hundred thousand, three hundred ninety".