19789040 has 20 divisors (see below), whose sum is σ = 46009704. Its totient is φ = 7915584.

The previous prime is 19789027. The next prime is 19789069. The reversal of 19789040 is 4098791.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×19789040² = 783212208243200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19788985 and 19789003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123602 + ... + 123761.

Almost surely, 2^19789040 is an apocalyptic number.

19789040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19789040 is an abundant number, since it is smaller than the sum of its proper divisors (26220664).

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

19789040 is a wasteful number, since it uses less digits than its factorization.

19789040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247376 (or 247370 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 19789040 is about 4448.4873833698. The cubic root of 19789040 is about 270.4839969896.

The spelling of 19789040 in words is "nineteen million, seven hundred eighty-nine thousand, forty".