19308993 has 16 divisors (see below), whose sum is σ = 28195776. Its totient is φ = 11656640.

The previous prime is 19308979. The next prime is 19309009. The reversal of 19308993 is 39980391.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19308993 - 2⁴ = 19308977 is a prime.

It is a super-3 number, since 3×19308993³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (19308893) 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, 8671 + ... + 10667.

It is an arithmetic number, because the mean of its divisors is an integer number (1762236).

Almost surely, 2^19308993 is an apocalyptic number.

It is an amenable number.

19308993 is a deficient number, since it is larger than the sum of its proper divisors (8886783).

19308993 is a wasteful number, since it uses less digits than its factorization.

19308993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 19308993 is about 4394.1999271767. The cubic root of 19308993 is about 268.2789152750.

It can be divided in two parts, 19308 and 993, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 19308993 in words is "nineteen million, three hundred eight thousand, nine hundred ninety-three".