1872399 has 4 divisors (see below), whose sum is σ = 2496536. Its totient is φ = 1248264.

The previous prime is 1872389. The next prime is 1872419. The reversal of 1872399 is 9932781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9932781 = 3 ⋅3310927.

It is not a de Polignac number, because 1872399 - 2⁷ = 1872271 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1872319) 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, 312064 + ... + 312069.

It is an arithmetic number, because the mean of its divisors is an integer number (624134).

2^1872399 is an apocalyptic number.

1872399 is a deficient number, since it is larger than the sum of its proper divisors (624137).

1872399 is an equidigital number, since it uses as much as digits as its factorization.

1872399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624136.

The product of its digits is 27216, while the sum is 39.

The square root of 1872399 is about 1368.3563132459. The cubic root of 1872399 is about 123.2535585075.

The spelling of 1872399 in words is "one million, eight hundred seventy-two thousand, three hundred ninety-nine".