19942679 has 8 divisors (see below), whose sum is σ = 20964960. Its totient is φ = 18933376.

The previous prime is 19942673. The next prime is 19942709. The reversal of 19942679 is 97624991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19942679 - 2⁸ = 19942423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19942673) 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 7 ways as a sum of consecutive naturals, for example, 14 + ... + 6315.

It is an arithmetic number, because the mean of its divisors is an integer number (2620620).

Almost surely, 2^19942679 is an apocalyptic number.

19942679 is a deficient number, since it is larger than the sum of its proper divisors (1022281).

19942679 is a wasteful number, since it uses less digits than its factorization.

19942679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6489.

The product of its digits is 244944, while the sum is 47.

The square root of 19942679 is about 4465.7226738793. The cubic root of 19942679 is about 271.1821916341.

The spelling of 19942679 in words is "nineteen million, nine hundred forty-two thousand, six hundred seventy-nine".