19994542 has 8 divisors (see below), whose sum is σ = 30439656. Its totient is φ = 9847992.

The previous prime is 19994539. The next prime is 19994549. The reversal of 19994542 is 24549991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19994549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74473 + ... + 74740.

It is an arithmetic number, because the mean of its divisors is an integer number (3804957).

Almost surely, 2^19994542 is an apocalyptic number.

19994542 is a deficient number, since it is larger than the sum of its proper divisors (10445114).

19994542 is a wasteful number, since it uses less digits than its factorization.

19994542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149282.

The product of its digits is 116640, while the sum is 43.

The square root of 19994542 is about 4471.5256904104. The cubic root of 19994542 is about 271.4170672607.

The spelling of 19994542 in words is "nineteen million, nine hundred ninety-four thousand, five hundred forty-two".