1197721 has 4 divisors (see below), whose sum is σ = 1368832. Its totient is φ = 1026612.

The previous prime is 1197709. The next prime is 1197739. The reversal of 1197721 is 1277911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1197721 - 2¹¹ = 1195673 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1197721.

It is not an unprimeable number, because it can be changed into a prime (1197751) 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, 85545 + ... + 85558.

It is an arithmetic number, because the mean of its divisors is an integer number (342208).

2^1197721 is an apocalyptic number.

It is an amenable number.

1197721 is a deficient number, since it is larger than the sum of its proper divisors (171111).

1197721 is an equidigital number, since it uses as much as digits as its factorization.

1197721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171110.

The product of its digits is 882, while the sum is 28.

The square root of 1197721 is about 1094.4044042309. The cubic root of 1197721 is about 106.1985420951.

The spelling of 1197721 in words is "one million, one hundred ninety-seven thousand, seven hundred twenty-one".