39493999 has 4 divisors (see below), whose sum is σ = 39512520. Its totient is φ = 39475480.

The previous prime is 39493981. The next prime is 39494047. The reversal of 39493999 is 99939493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99939493 = 229 ⋅436417.

It is a cyclic number.

It is not a de Polignac number, because 39493999 - 2¹³ = 39485807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39493939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5572 + ... + 10489.

It is an arithmetic number, because the mean of its divisors is an integer number (9878130).

Almost surely, 2^39493999 is an apocalyptic number.

39493999 is a deficient number, since it is larger than the sum of its proper divisors (18521).

39493999 is a wasteful number, since it uses less digits than its factorization.

39493999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18520.

The product of its digits is 2125764, while the sum is 55.

The square root of 39493999 is about 6284.4251129280. The cubic root of 39493999 is about 340.5469828785.

The spelling of 39493999 in words is "thirty-nine million, four hundred ninety-three thousand, nine hundred ninety-nine".