618955 has 4 divisors (see below), whose sum is σ = 742752. Its totient is φ = 495160.

The previous prime is 618941. The next prime is 618971. The reversal of 618955 is 559816.

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

It is not a de Polignac number, because 618955 - 2¹³ = 610763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 618955.

It is an unprimeable number.

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, 61891 + ... + 61900.

It is an arithmetic number, because the mean of its divisors is an integer number (185688).

2⁶¹⁸⁹⁵⁵ is an apocalyptic number.

618955 is a deficient number, since it is larger than the sum of its proper divisors (123797).

618955 is a wasteful number, since it uses less digits than its factorization.

618955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123796.

The product of its digits is 10800, while the sum is 34.

The square root of 618955 is about 786.7369318902. The cubic root of 618955 is about 85.2222557154. Note that the first 4 decimals are identical.

The spelling of 618955 in words is "six hundred eighteen thousand, nine hundred fifty-five".