19899436 has 12 divisors (see below), whose sum is σ = 35046928. Its totient is φ = 9886032.

The previous prime is 19899353. The next prime is 19899437. The reversal of 19899436 is 63499891.

It is a self number, because there is not a number n which added to its sum of digits gives 19899436.

It is not an unprimeable number, because it can be changed into a prime (19899437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15216 + ... + 16471.

Almost surely, 2^19899436 is an apocalyptic number.

It is an amenable number.

19899436 is a deficient number, since it is larger than the sum of its proper divisors (15147492).

19899436 is a wasteful number, since it uses less digits than its factorization.

19899436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31848 (or 31846 counting only the distinct ones).

The product of its digits is 419904, while the sum is 49.

The square root of 19899436 is about 4460.8783888378. The cubic root of 19899436 is about 270.9860424995.

The spelling of 19899436 in words is "nineteen million, eight hundred ninety-nine thousand, four hundred thirty-six".