19305993 has 16 divisors (see below), whose sum is σ = 30698496. Its totient is φ = 10552080.

The previous prime is 19305989. The next prime is 19306013. The reversal of 19305993 is 39950391.

It is not a de Polignac number, because 19305993 - 2² = 19305989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19305953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19503 + ... + 20468.

It is an arithmetic number, because the mean of its divisors is an integer number (1918656).

Almost surely, 2^19305993 is an apocalyptic number.

It is an amenable number.

19305993 is a deficient number, since it is larger than the sum of its proper divisors (11392503).

19305993 is a wasteful number, since it uses less digits than its factorization.

19305993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40004.

The product of its (nonzero) digits is 32805, while the sum is 39.

The square root of 19305993 is about 4393.8585548468. The cubic root of 19305993 is about 268.2650205675.

The spelling of 19305993 in words is "nineteen million, three hundred five thousand, nine hundred ninety-three".