19969638 has 16 divisors (see below), whose sum is σ = 43011696. Its totient is φ = 6144480.

The previous prime is 19969637. The next prime is 19969639. The reversal of 19969638 is 83696991.

It is an interprime number because it is at equal distance from previous prime (19969637) and next prime (19969639).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19969633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127933 + ... + 128088.

It is an arithmetic number, because the mean of its divisors is an integer number (2688231).

Almost surely, 2^19969638 is an apocalyptic number.

19969638 is an abundant number, since it is smaller than the sum of its proper divisors (23042058).

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

19969638 is a wasteful number, since it uses less digits than its factorization.

19969638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256039.

The product of its digits is 629856, while the sum is 51.

The square root of 19969638 is about 4468.7400908981. The cubic root of 19969638 is about 271.3043335133.

The spelling of 19969638 in words is "nineteen million, nine hundred sixty-nine thousand, six hundred thirty-eight".