19397638 has 16 divisors (see below), whose sum is σ = 31461696. Its totient is φ = 8916480.

The previous prime is 19397617. The next prime is 19397683. The reversal of 19397638 is 83679391.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5670 + ... + 8422.

It is an arithmetic number, because the mean of its divisors is an integer number (1966356).

Almost surely, 2^19397638 is an apocalyptic number.

19397638 is a deficient number, since it is larger than the sum of its proper divisors (12064058).

19397638 is a wasteful number, since it uses less digits than its factorization.

19397638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039.

The product of its digits is 244944, while the sum is 46.

The square root of 19397638 is about 4404.2749687094. The cubic root of 19397638 is about 268.6888328074.

The spelling of 19397638 in words is "nineteen million, three hundred ninety-seven thousand, six hundred thirty-eight".