19939873 has 16 divisors (see below), whose sum is σ = 22164480. Its totient is φ = 17853264.

The previous prime is 19939811. The next prime is 19939879. The reversal of 19939873 is 37893991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19939873 is a prime.

It is a super-2 number, since 2×19939873² = 795197070512258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19939879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44790 + ... + 45232.

It is an arithmetic number, because the mean of its divisors is an integer number (1385280).

Almost surely, 2^19939873 is an apocalyptic number.

It is an amenable number.

19939873 is a deficient number, since it is larger than the sum of its proper divisors (2224607).

19939873 is a wasteful number, since it uses less digits than its factorization.

19939873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588.

The product of its digits is 367416, while the sum is 49.

The square root of 19939873 is about 4465.4084919523. The cubic root of 19939873 is about 271.1694722978.

The spelling of 19939873 in words is "nineteen million, nine hundred thirty-nine thousand, eight hundred seventy-three".