1199920 has 40 divisors (see below), whose sum is σ = 2852496. Its totient is φ = 469248.

The previous prime is 1199909. The next prime is 1199923. The reversal of 1199920 is 299911.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 4099 + ... + 4381.

2^1199920 is an apocalyptic number.

1199920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1199920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426248).

1199920 is an abundant number, since it is smaller than the sum of its proper divisors (1652576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1199920 is a wasteful number, since it uses less digits than its factorization.

1199920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 1199920 is about 1095.4085995646. The cubic root of 1199920 is about 106.2634954023.

Subtracting from 1199920 its reverse (299911), we obtain a palindrome (900009).

The spelling of 1199920 in words is "one million, one hundred ninety-nine thousand, nine hundred twenty".