2109991742 has 8 divisors (see below), whose sum is σ = 3165516936. Its totient is φ = 1054819432.

The previous prime is 2109991693. The next prime is 2109991759. The reversal of 2109991742 is 2471999012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2109991693 and 2109991702.

It is a congruent number.

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, 72728 + ... + 97515.

It is an arithmetic number, because the mean of its divisors is an integer number (395689617).

Almost surely, 2^2109991742 is an apocalyptic number.

2109991742 is a deficient number, since it is larger than the sum of its proper divisors (1055525194).

2109991742 is a wasteful number, since it uses less digits than its factorization.

2109991742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176442.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 2109991742 is about 45934.6464229344. The cubic root of 2109991742 is about 1282.6069391149.

The spelling of 2109991742 in words is "two billion, one hundred nine million, nine hundred ninety-one thousand, seven hundred forty-two".