1872797645 has 4 divisors (see below), whose sum is σ = 2247357180. Its totient is φ = 1498238112.

The previous prime is 1872797629. The next prime is 1872797653. The reversal of 1872797645 is 5467972781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1217591236 + 655206409 = 34894^2 + 25597^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872797645 - 2⁴ = 1872797629 is a prime.

It is a super-3 number, since 3×1872797645³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187279760 + ... + 187279769.

It is an arithmetic number, because the mean of its divisors is an integer number (561839295).

Almost surely, 2^1872797645 is an apocalyptic number.

It is an amenable number.

1872797645 is a deficient number, since it is larger than the sum of its proper divisors (374559535).

1872797645 is an equidigital number, since it uses as much as digits as its factorization.

1872797645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374559534.

The product of its digits is 5927040, while the sum is 56.

The square root of 1872797645 is about 43275.8321121616. The cubic root of 1872797645 is about 1232.6230502794.

The spelling of 1872797645 in words is "one billion, eight hundred seventy-two million, seven hundred ninety-seven thousand, six hundred forty-five".