19844138 has 16 divisors (see below), whose sum is σ = 30342816. Its totient is φ = 9731760.

The previous prime is 19844129. The next prime is 19844141. The reversal of 19844138 is 83144891.

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, 28373 + ... + 29063.

It is an arithmetic number, because the mean of its divisors is an integer number (1896426).

Almost surely, 2^19844138 is an apocalyptic number.

19844138 is a deficient number, since it is larger than the sum of its proper divisors (10498678).

19844138 is a wasteful number, since it uses less digits than its factorization.

19844138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949.

The product of its digits is 27648, while the sum is 38.

The square root of 19844138 is about 4454.6759702587. The cubic root of 19844138 is about 270.7347977221.

The spelling of 19844138 in words is "nineteen million, eight hundred forty-four thousand, one hundred thirty-eight".