19930239 has 32 divisors (see below), whose sum is σ = 35735040. Its totient is φ = 10717056.

The previous prime is 19930231. The next prime is 19930243. The reversal of 19930239 is 93203991.

It is not a de Polignac number, because 19930239 - 2³ = 19930231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19930231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112 + ... + 6314.

It is an arithmetic number, because the mean of its divisors is an integer number (1116720).

Almost surely, 2^19930239 is an apocalyptic number.

19930239 is a deficient number, since it is larger than the sum of its proper divisors (15804801).

19930239 is a wasteful number, since it uses less digits than its factorization.

19930239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6236 (or 6230 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 19930239 is about 4464.3296249269. The cubic root of 19930239 is about 271.1257931907.

The spelling of 19930239 in words is "nineteen million, nine hundred thirty thousand, two hundred thirty-nine".