2091900 has 72 divisors (see below), whose sum is σ = 6388480. Its totient is φ = 527040.

The previous prime is 2091889. The next prime is 2091913. The reversal of 2091900 is 91902.

2091900 = T₈₄ + T₈₅ + ... + T₂₃₅.

It is a happy number.

It is a super-2 number, since 2×2091900² = 8752091220000, 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 23 ways as a sum of consecutive naturals, for example, 5517 + ... + 5883.

2^2091900 is an apocalyptic number.

2091900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2091900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3194240).

2091900 is an abundant number, since it is smaller than the sum of its proper divisors (4296580).

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

2091900 is a wasteful number, since it uses less digits than its factorization.

2091900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 2091900 is about 1446.3402089412. The cubic root of 2091900 is about 127.8930584637.

The spelling of 2091900 in words is "two million, ninety-one thousand, nine hundred".