19991092 has 24 divisors (see below), whose sum is σ = 39483360. Its totient is φ = 8772960.

The previous prime is 19991089. The next prime is 19991107. The reversal of 19991092 is 29019991.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6558 + ... + 9109.

It is an arithmetic number, because the mean of its divisors is an integer number (1645140).

Almost surely, 2^19991092 is an apocalyptic number.

It is an amenable number.

19991092 is a deficient number, since it is larger than the sum of its proper divisors (19492268).

19991092 is a wasteful number, since it uses less digits than its factorization.

19991092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15711 (or 15709 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 19991092 is about 4471.1398993993. The cubic root of 19991092 is about 271.4014556212.

It can be divided in two parts, 199910 and 92, that added together give a palindrome (200002).

The spelling of 19991092 in words is "nineteen million, nine hundred ninety-one thousand, ninety-two".