617993 has 4 divisors (see below), whose sum is σ = 633108. Its totient is φ = 602880.

The previous prime is 617983. The next prime is 618029. The reversal of 617993 is 399716.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139129 + 478864 = 373^2 + 692^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-617993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617963) 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, 7496 + ... + 7577.

It is an arithmetic number, because the mean of its divisors is an integer number (158277).

2⁶¹⁷⁹⁹³ is an apocalyptic number.

It is an amenable number.

617993 is a deficient number, since it is larger than the sum of its proper divisors (15115).

617993 is a wasteful number, since it uses less digits than its factorization.

617993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15114.

The product of its digits is 10206, while the sum is 35.

The square root of 617993 is about 786.1253080775. The cubic root of 617993 is about 85.1780810874.

The spelling of 617993 in words is "six hundred seventeen thousand, nine hundred ninety-three".