19991494 has 16 divisors (see below), whose sum is σ = 30780000. Its totient is φ = 9734400.

The previous prime is 19991483. The next prime is 19991509. The reversal of 19991494 is 49419991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15382 + ... + 16630.

It is an arithmetic number, because the mean of its divisors is an integer number (1923750).

Almost surely, 2^19991494 is an apocalyptic number.

19991494 is a deficient number, since it is larger than the sum of its proper divisors (10788506).

19991494 is a wasteful number, since it uses less digits than its factorization.

19991494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455.

The product of its digits is 104976, while the sum is 46.

The square root of 19991494 is about 4471.1848541522. The cubic root of 19991494 is about 271.4032748091.

The spelling of 19991494 in words is "nineteen million, nine hundred ninety-one thousand, four hundred ninety-four".