1373721 has 16 divisors (see below), whose sum is σ = 1959936. Its totient is φ = 853776.

The previous prime is 1373717. The next prime is 1373761. The reversal of 1373721 is 1273731.

It is not a de Polignac number, because 1373721 - 2² = 1373717 is a prime.

1373721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1373691 and 1373700.

It is not an unprimeable number, because it can be changed into a prime (1373761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2736 + ... + 3198.

It is an arithmetic number, because the mean of its divisors is an integer number (122496).

2^1373721 is an apocalyptic number.

It is an amenable number.

1373721 is a deficient number, since it is larger than the sum of its proper divisors (586215).

1373721 is a wasteful number, since it uses less digits than its factorization.

1373721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532.

The product of its digits is 882, while the sum is 24.

The square root of 1373721 is about 1172.0584456417. The cubic root of 1373721 is about 111.1645154018.

The spelling of 1373721 in words is "one million, three hundred seventy-three thousand, seven hundred twenty-one".