1991752 has 24 divisors (see below), whose sum is σ = 4345110. Its totient is φ = 853440.

The previous prime is 1991729. The next prime is 1991753. The reversal of 1991752 is 2571991.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 70756 = 1386^2 + 266^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1991753) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2149 + ... + 2932.

2^1991752 is an apocalyptic number.

It is an amenable number.

1991752 is an abundant number, since it is smaller than the sum of its proper divisors (2353358).

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

1991752 is a wasteful number, since it uses less digits than its factorization.

1991752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101 (or 5090 counting only the distinct ones).

The product of its digits is 5670, while the sum is 34.

The square root of 1991752 is about 1411.2944412843. The cubic root of 1991752 is about 125.8186692072.

The spelling of 1991752 in words is "one million, nine hundred ninety-one thousand, seven hundred fifty-two".