1991734448 has 20 divisors (see below), whose sum is σ = 4209802728. Its totient is φ = 905333760.

The previous prime is 1991734421. The next prime is 1991734453. The reversal of 1991734448 is 8444371991.

It is a super-2 number, since 2×1991734448² = 7934012222699729408, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1991734396 and 1991734405.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5658161 + ... + 5658512.

Almost surely, 2^1991734448 is an apocalyptic number.

It is an amenable number.

1991734448 is an abundant number, since it is smaller than the sum of its proper divisors (2218068280).

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

1991734448 is a wasteful number, since it uses less digits than its factorization.

1991734448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11316692 (or 11316686 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

The square root of 1991734448 is about 44628.8521922758. The cubic root of 1991734448 is about 1258.1829962036.

The spelling of 1991734448 in words is "one billion, nine hundred ninety-one million, seven hundred thirty-four thousand, four hundred forty-eight".