19994145 has 16 divisors (see below), whose sum is σ = 32084160. Its totient is φ = 10632384.

The previous prime is 19994131. The next prime is 19994201. The reversal of 19994145 is 54149991.

It is a happy number.

It is not a de Polignac number, because 19994145 - 2⁵ = 19994113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19994097 and 19994106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3927 + ... + 7443.

It is an arithmetic number, because the mean of its divisors is an integer number (2005260).

Almost surely, 2^19994145 is an apocalyptic number.

19994145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19994145 is a deficient number, since it is larger than the sum of its proper divisors (12090015).

19994145 is a wasteful number, since it uses less digits than its factorization.

19994145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904.

The product of its digits is 58320, while the sum is 42.

The square root of 19994145 is about 4471.4812981830. The cubic root of 19994145 is about 271.4152708824.

The spelling of 19994145 in words is "nineteen million, nine hundred ninety-four thousand, one hundred forty-five".