2157500 has 30 divisors (see below), whose sum is σ = 4723488. Its totient is φ = 862000.

The previous prime is 2157499. The next prime is 2157503. The reversal of 2157500 is 57512.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157503) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2069 + ... + 2931.

2^2157500 is an apocalyptic number.

2157500 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 2157500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2361744).

2157500 is an abundant number, since it is smaller than the sum of its proper divisors (2565988).

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

2157500 is an equidigital number, since it uses as much as digits as its factorization.

2157500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 2157500 is about 1468.8430821568. The cubic root of 2157500 is about 129.2161909757.

The spelling of 2157500 in words is "two million, one hundred fifty-seven thousand, five hundred".