4987993 has 4 divisors (see below), whose sum is σ = 5148928. Its totient is φ = 4827060.

The previous prime is 4987979. The next prime is 4987999. The reversal of 4987993 is 3997894.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3997894 = 2 ⋅1998947.

It is a cyclic number.

It is not a de Polignac number, because 4987993 - 2¹³ = 4979801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4987999) 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, 80421 + ... + 80482.

It is an arithmetic number, because the mean of its divisors is an integer number (1287232).

Almost surely, 2^4987993 is an apocalyptic number.

It is an amenable number.

4987993 is a deficient number, since it is larger than the sum of its proper divisors (160935).

4987993 is a wasteful number, since it uses less digits than its factorization.

4987993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160934.

The product of its digits is 489888, while the sum is 49.

The square root of 4987993 is about 2233.3815168932. The cubic root of 4987993 is about 170.8606070805.

Subtracting from 4987993 its reverse (3997894), we obtain a palindrome (990099).

The spelling of 4987993 in words is "four million, nine hundred eighty-seven thousand, nine hundred ninety-three".