1872291 has 4 divisors (see below), whose sum is σ = 2496392. Its totient is φ = 1248192.

The previous prime is 1872289. The next prime is 1872301. The reversal of 1872291 is 1922781.

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

It is not a de Polignac number, because 1872291 - 2¹ = 1872289 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1872271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312046 + ... + 312051.

It is an arithmetic number, because the mean of its divisors is an integer number (624098).

2^1872291 is an apocalyptic number.

1872291 is a deficient number, since it is larger than the sum of its proper divisors (624101).

1872291 is an equidigital number, since it uses as much as digits as its factorization.

1872291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624100.

The product of its digits is 2016, while the sum is 30.

The square root of 1872291 is about 1368.3168492714. The cubic root of 1872291 is about 123.2511887063.

The spelling of 1872291 in words is "one million, eight hundred seventy-two thousand, two hundred ninety-one".