2157700 has 18 divisors (see below), whose sum is σ = 4682426. Its totient is φ = 863040.

The previous prime is 2157679. The next prime is 2157709. The reversal of 2157700 is 77512.

It can be written as a sum of positive squares in 3 ways, for example, as 399424 + 1758276 = 632^2 + 1326^2 .

It is not an unprimeable number, because it can be changed into a prime (2157709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10689 + ... + 10888.

2^2157700 is an apocalyptic number.

2157700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157700 is an abundant number, since it is smaller than the sum of its proper divisors (2524726).

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

2157700 is a wasteful number, since it uses less digits than its factorization.

2157700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21591 (or 21584 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 2157700 is about 1468.9111613709. The cubic root of 2157700 is about 129.2201836277.

The spelling of 2157700 in words is "two million, one hundred fifty-seven thousand, seven hundred".