19894438 has 4 divisors (see below), whose sum is σ = 29841660. Its totient is φ = 9947218.

The previous prime is 19894421. The next prime is 19894447. The reversal of 19894438 is 83449891.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4973608 + ... + 4973611.

It is an arithmetic number, because the mean of its divisors is an integer number (7460415).

Almost surely, 2^19894438 is an apocalyptic number.

19894438 is a deficient number, since it is larger than the sum of its proper divisors (9947222).

19894438 is an equidigital number, since it uses as much as digits as its factorization.

19894438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9947221.

The product of its digits is 248832, while the sum is 46.

The square root of 19894438 is about 4460.3181500875. The cubic root of 19894438 is about 270.9633533867.

The spelling of 19894438 in words is "nineteen million, eight hundred ninety-four thousand, four hundred thirty-eight".