19638642 has 32 divisors (see below), whose sum is σ = 41420160. Its totient is φ = 6195200.

The previous prime is 19638637. The next prime is 19638653. The reversal of 19638642 is 24683691.

It is a self number, because there is not a number n which added to its sum of digits gives 19638642.

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 15 ways as a sum of consecutive naturals, for example, 13234 + ... + 14642.

It is an arithmetic number, because the mean of its divisors is an integer number (1294380).

Almost surely, 2^19638642 is an apocalyptic number.

19638642 is an abundant number, since it is smaller than the sum of its proper divisors (21781518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19638642 is a wasteful number, since it uses less digits than its factorization.

19638642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538.

The product of its digits is 62208, while the sum is 39.

The square root of 19638642 is about 4431.5507443783. The cubic root of 19638642 is about 269.7970216561.

The spelling of 19638642 in words is "nineteen million, six hundred thirty-eight thousand, six hundred forty-two".