2180745 has 72 divisors (see below), whose sum is σ = 4694976. Its totient is φ = 931392.

The previous prime is 2180741. The next prime is 2180747. The reversal of 2180745 is 5470812.

It is not a de Polignac number, because 2180745 - 2² = 2180741 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2180741) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 50694 + ... + 50736.

It is an arithmetic number, because the mean of its divisors is an integer number (65208).

2^2180745 is an apocalyptic number.

It is an amenable number.

2180745 is an abundant number, since it is smaller than the sum of its proper divisors (2514231).

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

2180745 is a wasteful number, since it uses less digits than its factorization.

2180745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 2180745 is about 1476.7345733069. The cubic root of 2180745 is about 129.6785945886.

The spelling of 2180745 in words is "two million, one hundred eighty thousand, seven hundred forty-five".