19939842 has 24 divisors (see below), whose sum is σ = 46526844. Its totient is φ = 6135264.

The previous prime is 19939811. The next prime is 19939879. The reversal of 19939842 is 24893991.

It can be written as a sum of positive squares in 2 ways, for example, as 19000881 + 938961 = 4359^2 + 969^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42373 + ... + 42840.

Almost surely, 2^19939842 is an apocalyptic number.

19939842 is an abundant number, since it is smaller than the sum of its proper divisors (26587002).

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

19939842 is a wasteful number, since it uses less digits than its factorization.

19939842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85234 (or 85231 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 19939842 is about 4465.4050208240. The cubic root of 19939842 is about 271.1693317711.

The spelling of 19939842 in words is "nineteen million, nine hundred thirty-nine thousand, eight hundred forty-two".