1823721 has 8 divisors (see below), whose sum is σ = 2491104. Its totient is φ = 1186080.

The previous prime is 1823719. The next prime is 1823729. The reversal of 1823721 is 1273281.

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

It is not a de Polignac number, because 1823721 - 2¹ = 1823719 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1823691 and 1823700.

It is not an unprimeable number, because it can be changed into a prime (1823729) 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, 7291 + ... + 7536.

It is an arithmetic number, because the mean of its divisors is an integer number (311388).

2^1823721 is an apocalyptic number.

It is an amenable number.

1823721 is a deficient number, since it is larger than the sum of its proper divisors (667383).

1823721 is a wasteful number, since it uses less digits than its factorization.

1823721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14871.

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

The square root of 1823721 is about 1350.4521465050. The cubic root of 1823721 is about 122.1760648788.

The spelling of 1823721 in words is "one million, eight hundred twenty-three thousand, seven hundred twenty-one".