618993 has 6 divisors (see below), whose sum is σ = 894114. Its totient is φ = 412656.

The previous prime is 618991. The next prime is 618997. The reversal of 618993 is 399816.

It can be written as a sum of positive squares in only one way, i.e., 567009 + 51984 = 753^2 + 228^2 .

It is not a de Polignac number, because 618993 - 2¹ = 618991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (618991) 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 5 ways as a sum of consecutive naturals, for example, 34380 + ... + 34397.

It is an arithmetic number, because the mean of its divisors is an integer number (149019).

2⁶¹⁸⁹⁹³ is an apocalyptic number.

It is an amenable number.

618993 is a deficient number, since it is larger than the sum of its proper divisors (275121).

618993 is a wasteful number, since it uses less digits than its factorization.

618993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68783 (or 68780 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 618993 is about 786.7610819048. The cubic root of 618993 is about 85.2239997192.

The spelling of 618993 in words is "six hundred eighteen thousand, nine hundred ninety-three".