2155800 has 48 divisors (see below), whose sum is σ = 6684840. Its totient is φ = 574720.

The previous prime is 2155799. The next prime is 2155837. The reversal of 2155800 is 85512.

2155800 = T₃₅ + T₃₆ + ... + T₂₃₄.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1197 + ... + 2396.

2^2155800 is an apocalyptic number.

2155800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155800 is an abundant number, since it is smaller than the sum of its proper divisors (4529040).

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

2155800 is a wasteful number, since it uses less digits than its factorization.

2155800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612 (or 3603 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 2155800 is about 1468.2642813881. The cubic root of 2155800 is about 129.1822434677.

The spelling of 2155800 in words is "two million, one hundred fifty-five thousand, eight hundred".