1872372509 has 4 divisors (see below), whose sum is σ = 2139854304. Its totient is φ = 1604890716.

The previous prime is 1872372497. The next prime is 1872372517. The reversal of 1872372509 is 9052732781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1872372509 - 2²⁰ = 1871323933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1872372509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1872372529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133740887 + ... + 133740900.

It is an arithmetic number, because the mean of its divisors is an integer number (534963576).

Almost surely, 2^1872372509 is an apocalyptic number.

It is an amenable number.

1872372509 is a deficient number, since it is larger than the sum of its proper divisors (267481795).

1872372509 is an equidigital number, since it uses as much as digits as its factorization.

1872372509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267481794.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 1872372509 is about 43270.9199000899. The cubic root of 1872372509 is about 1232.5297723444.

The spelling of 1872372509 in words is "one billion, eight hundred seventy-two million, three hundred seventy-two thousand, five hundred nine".