1991452 has 12 divisors (see below), whose sum is σ = 3570336. Its totient is φ = 971360.

The previous prime is 1991449. The next prime is 1991461. The reversal of 1991452 is 2541991.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5908 + ... + 6235.

It is an arithmetic number, because the mean of its divisors is an integer number (297528).

2^1991452 is an apocalyptic number.

It is an amenable number.

1991452 is a deficient number, since it is larger than the sum of its proper divisors (1578884).

1991452 is a wasteful number, since it uses less digits than its factorization.

1991452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12188 (or 12186 counting only the distinct ones).

The product of its digits is 3240, while the sum is 31.

The square root of 1991452 is about 1411.1881518777. The cubic root of 1991452 is about 125.8123519053.

The spelling of 1991452 in words is "one million, nine hundred ninety-one thousand, four hundred fifty-two".