913993 has 4 divisors (see below), whose sum is σ = 945540. Its totient is φ = 882448.

The previous prime is 913981. The next prime is 913999. The reversal of 913993 is 399319.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399319 = 197 ⋅2027.

It can be written as a sum of positive squares in 2 ways, for example, as 278784 + 635209 = 528^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 913993 - 2¹⁷ = 782921 is a prime.

It is a Duffinian number.

913993 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (913999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15730 + ... + 15787.

It is an arithmetic number, because the mean of its divisors is an integer number (236385).

2⁹¹³⁹⁹³ is an apocalyptic number.

It is an amenable number.

913993 is a deficient number, since it is larger than the sum of its proper divisors (31547).

913993 is a wasteful number, since it uses less digits than its factorization.

913993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31546.

The product of its digits is 6561, while the sum is 34.

The square root of 913993 is about 956.0298112507. The cubic root of 913993 is about 97.0467412101.

It can be divided in two parts, 913 and 993, that multiplied together give a palindrome (906609).

The spelling of 913993 in words is "nine hundred thirteen thousand, nine hundred ninety-three".