1872321 has 8 divisors (see below), whose sum is σ = 2723424. Its totient is φ = 1134720.

The previous prime is 1872319. The next prime is 1872323. The reversal of 1872321 is 1232781.

It is an interprime number because it is at equal distance from previous prime (1872319) and next prime (1872323).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1872321 - 2¹ = 1872319 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

1872321 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1872291 and 1872300.

It is not an unprimeable number, because it can be changed into a prime (1872323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28336 + ... + 28401.

It is an arithmetic number, because the mean of its divisors is an integer number (340428).

2^1872321 is an apocalyptic number.

1872321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1872321 is a deficient number, since it is larger than the sum of its proper divisors (851103).

1872321 is a wasteful number, since it uses less digits than its factorization.

1872321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56751.

The product of its digits is 672, while the sum is 24.

The square root of 1872321 is about 1368.3278116007. The cubic root of 1872321 is about 123.2518469936.

The spelling of 1872321 in words is "one million, eight hundred seventy-two thousand, three hundred twenty-one".