1991832 has 32 divisors (see below), whose sum is σ = 5022000. Its totient is φ = 658304.

The previous prime is 1991819. The next prime is 1991837. The reversal of 1991832 is 2381991.

It is a junction number, because it is equal to n+sod(n) for n = 1991793 and 1991802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991837) 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, 3298 + ... + 3854.

2^1991832 is an apocalyptic number.

1991832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1991832 is an abundant number, since it is smaller than the sum of its proper divisors (3030168).

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

1991832 is a wasteful number, since it uses less digits than its factorization.

1991832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715 (or 711 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 1991832 is about 1411.3227837741. The cubic root of 1991832 is about 125.8203537139.

The spelling of 1991832 in words is "one million, nine hundred ninety-one thousand, eight hundred thirty-two".