2151900 has 72 divisors (see below), whose sum is σ = 6926640. Its totient is φ = 573120.

The previous prime is 2151899. The next prime is 2151917. The reversal of 2151900 is 91512.

2151900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2151900² = 9261347220000, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2302 + ... + 3098.

2^2151900 is an apocalyptic number.

2151900 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 2151900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3463320).

2151900 is an abundant number, since it is smaller than the sum of its proper divisors (4774740).

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

2151900 is a wasteful number, since it uses less digits than its factorization.

2151900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 807 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 2151900 is about 1466.9355814077. The cubic root of 2151900 is about 129.1042964001.

The spelling of 2151900 in words is "two million, one hundred fifty-one thousand, nine hundred".