618749 has 6 divisors (see below), whose sum is σ = 657594. Its totient is φ = 582080.

The previous prime is 618719. The next prime is 618799. The reversal of 618749 is 947816.

It can be written as a sum of positive squares in 3 ways, for example, as 422500 + 196249 = 650^2 + 443^2 .

It is a de Polignac number, because none of the positive numbers 2^k-618749 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 782 + ... + 1359.

It is an arithmetic number, because the mean of its divisors is an integer number (109599).

2⁶¹⁸⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

618749 is a deficient number, since it is larger than the sum of its proper divisors (38845).

618749 is a wasteful number, since it uses less digits than its factorization.

618749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175 (or 2158 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 618749 is about 786.6060004856. The cubic root of 618749 is about 85.2128001370.

The spelling of 618749 in words is "six hundred eighteen thousand, seven hundred forty-nine".