1991934 has 24 divisors (see below), whose sum is σ = 4932720. Its totient is φ = 569088.

The previous prime is 1991933. The next prime is 1991947. The reversal of 1991934 is 4391991.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7779 + ... + 8030.

It is an arithmetic number, because the mean of its divisors is an integer number (205530).

2^1991934 is an apocalyptic number.

1991934 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1991934 is an abundant number, since it is smaller than the sum of its proper divisors (2940786).

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

1991934 is a wasteful number, since it uses less digits than its factorization.

1991934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15824 (or 15821 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 1991934 is about 1411.3589196232. The cubic root of 1991934 is about 125.8225013945.

The spelling of 1991934 in words is "one million, nine hundred ninety-one thousand, nine hundred thirty-four".