19689036 has 12 divisors (see below), whose sum is σ = 45941112. Its totient is φ = 6563008.

The previous prime is 19689029. The next prime is 19689037. The reversal of 19689036 is 63098691.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (19689037) 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, 820365 + ... + 820388.

It is an arithmetic number, because the mean of its divisors is an integer number (3828426).

Almost surely, 2^19689036 is an apocalyptic number.

It is an amenable number.

19689036 is an abundant number, since it is smaller than the sum of its proper divisors (26252076).

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

19689036 is a wasteful number, since it uses less digits than its factorization.

19689036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640760 (or 1640758 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 19689036 is about 4437.2329215402. The cubic root of 19689036 is about 270.0275966306.

The spelling of 19689036 in words is "nineteen million, six hundred eighty-nine thousand, thirty-six".