19967139 has 12 divisors (see below), whose sum is σ = 29272776. Its totient is φ = 13112352.

The previous prime is 19967111. The next prime is 19967173. The reversal of 19967139 is 93176991.

It is not a de Polignac number, because 19967139 - 2⁵ = 19967107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19967094 and 19967103.

It is not an unprimeable number, because it can be changed into a prime (19967839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15954 + ... + 17159.

It is an arithmetic number, because the mean of its divisors is an integer number (2439398).

Almost surely, 2^19967139 is an apocalyptic number.

19967139 is a deficient number, since it is larger than the sum of its proper divisors (9305637).

19967139 is a wasteful number, since it uses less digits than its factorization.

19967139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33186 (or 33183 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 19967139 is about 4468.4604731384. The cubic root of 19967139 is about 271.2930160354.

The spelling of 19967139 in words is "nineteen million, nine hundred sixty-seven thousand, one hundred thirty-nine".