2161500 has 96 divisors (see below), whose sum is σ = 6918912. Its totient is φ = 520000.

The previous prime is 2161493. The next prime is 2161513. The reversal of 2161500 is 51612.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16435 + ... + 16565.

It is an arithmetic number, because the mean of its divisors is an integer number (72072).

2^2161500 is an apocalyptic number.

2161500 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 2161500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3459456).

2161500 is an abundant number, since it is smaller than the sum of its proper divisors (4757412).

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

2161500 is a wasteful number, since it uses less digits than its factorization.

2161500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 2161500 is about 1470.2040674682. The cubic root of 2161500 is about 129.2959971821.

The spelling of 2161500 in words is "two million, one hundred sixty-one thousand, five hundred".