19938518 has 16 divisors (see below), whose sum is σ = 32690304. Its totient is φ = 9079680.

The previous prime is 19938517. The next prime is 19938533. The reversal of 19938518 is 81583991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19938517) 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, 8405 + ... + 10512.

It is an arithmetic number, because the mean of its divisors is an integer number (2043144).

Almost surely, 2^19938518 is an apocalyptic number.

19938518 is a deficient number, since it is larger than the sum of its proper divisors (12751786).

19938518 is a wasteful number, since it uses less digits than its factorization.

19938518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18967.

The product of its digits is 77760, while the sum is 44.

The square root of 19938518 is about 4465.2567675331. The cubic root of 19938518 is about 271.1633297820.

The spelling of 19938518 in words is "nineteen million, nine hundred thirty-eight thousand, five hundred eighteen".