1199921 has 4 divisors (see below), whose sum is σ = 1202292. Its totient is φ = 1197552.

The previous prime is 1199909. The next prime is 1199923. The reversal of 1199921 is 1299911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1299911 = 73 ⋅17807.

It can be written as a sum of positive squares in 2 ways, for example, as 616225 + 583696 = 785^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1199921 - 2⁶ = 1199857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1199923) 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, 86 + ... + 1551.

It is an arithmetic number, because the mean of its divisors is an integer number (300573).

2^1199921 is an apocalyptic number.

It is an amenable number.

1199921 is a deficient number, since it is larger than the sum of its proper divisors (2371).

1199921 is an equidigital number, since it uses as much as digits as its factorization.

1199921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370.

The product of its digits is 1458, while the sum is 32.

The square root of 1199921 is about 1095.4090560151. The cubic root of 1199921 is about 106.2635249219.

The spelling of 1199921 in words is "one million, one hundred ninety-nine thousand, nine hundred twenty-one".