1799721 has 48 divisors (see below), whose sum is σ = 3369600. Its totient is φ = 917280.

The previous prime is 1799713. The next prime is 1799731. The reversal of 1799721 is 1279971.

It is not a de Polignac number, because 1799721 - 2³ = 1799713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1799701) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33931 + ... + 33983.

It is an arithmetic number, because the mean of its divisors is an integer number (70200).

2^1799721 is an apocalyptic number.

1799721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1799721 is a deficient number, since it is larger than the sum of its proper divisors (1569879).

1799721 is a wasteful number, since it uses less digits than its factorization.

1799721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 74 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 1799721 is about 1341.5368053095. The cubic root of 1799721 is about 121.6377546447.

The spelling of 1799721 in words is "one million, seven hundred ninety-nine thousand, seven hundred twenty-one".