2001090 has 64 divisors (see below), whose sum is σ = 5918976. Its totient is φ = 421632.

The previous prime is 2001079. The next prime is 2001101. The reversal of 2001090 is 901002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2001079) and next prime (2001101).

It is a super-2 number, since 2×2001090² = 8008722376200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2364 + ... + 3096.

It is an arithmetic number, because the mean of its divisors is an integer number (92484).

2^2001090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2959488).

2001090 is an abundant number, since it is smaller than the sum of its proper divisors (3917886).

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

2001090 is a wasteful number, since it uses less digits than its factorization.

2001090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 2001090 is about 1414.5988830760. The cubic root of 2001090 is about 126.0149893984.

Adding to 2001090 its reverse (901002), we get a palindrome (2902092).

It can be divided in two parts, 20010 and 90, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 2001090 in words is "two million, one thousand, ninety".