19980729 has 32 divisors (see below), whose sum is σ = 31726080. Its totient is φ = 12384000.

The previous prime is 19980713. The next prime is 19980743. The reversal of 19980729 is 92708991.

It is not a de Polignac number, because 19980729 - 2⁴ = 19980713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19910729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46144 + ... + 46574.

It is an arithmetic number, because the mean of its divisors is an integer number (991440).

Almost surely, 2^19980729 is an apocalyptic number.

It is an amenable number.

19980729 is a deficient number, since it is larger than the sum of its proper divisors (11745351).

19980729 is a wasteful number, since it uses less digits than its factorization.

19980729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 19980729 is about 4469.9808724423. The cubic root of 19980729 is about 271.3545510731.

The spelling of 19980729 in words is "nineteen million, nine hundred eighty thousand, seven hundred twenty-nine".