1991432 has 32 divisors (see below), whose sum is σ = 3974400. Its totient is φ = 933504.

The previous prime is 1991413. The next prime is 1991443. The reversal of 1991432 is 2341991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1991395 and 1991404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14468 + ... + 14604.

It is an arithmetic number, because the mean of its divisors is an integer number (124200).

2^1991432 is an apocalyptic number.

It is an amenable number.

1991432 is a deficient number, since it is larger than the sum of its proper divisors (1982968).

1991432 is a wasteful number, since it uses less digits than its factorization.

1991432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 241 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 1991432 is about 1411.1810656326. The cubic root of 1991432 is about 125.8119307293.

The spelling of 1991432 in words is "one million, nine hundred ninety-one thousand, four hundred thirty-two".