19939388 has 12 divisors (see below), whose sum is σ = 39878832. Its totient is φ = 8545440.

The previous prime is 19939369. The next prime is 19939393. The reversal of 19939388 is 88393991.

19939388 is an admirable number.

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, 356033 + ... + 356088.

It is an arithmetic number, because the mean of its divisors is an integer number (3323236).

Almost surely, 2^19939388 is an apocalyptic number.

It is an amenable number.

19939388 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19939388 is a wasteful number, since it uses less digits than its factorization.

19939388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712132 (or 712130 counting only the distinct ones).

The product of its digits is 419904, while the sum is 50.

The square root of 19939388 is about 4465.3541852803. The cubic root of 19939388 is about 271.1672737171.

The spelling of 19939388 in words is "nineteen million, nine hundred thirty-nine thousand, three hundred eighty-eight".