618987 has 16 divisors (see below), whose sum is σ = 894240. Its totient is φ = 379392.

The previous prime is 618979. The next prime is 618991. The reversal of 618987 is 789816.

It is not a de Polignac number, because 618987 - 2³ = 618979 is a prime.

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

618987 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 618987.

It is not an unprimeable number, because it can be changed into a prime (618997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2589 + ... + 2817.

It is an arithmetic number, because the mean of its divisors is an integer number (55890).

2⁶¹⁸⁹⁸⁷ is an apocalyptic number.

618987 is a deficient number, since it is larger than the sum of its proper divisors (275253).

618987 is a wasteful number, since it uses less digits than its factorization.

618987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302.

The product of its digits is 24192, while the sum is 39.

The square root of 618987 is about 786.7572687939. The cubic root of 618987 is about 85.2237243549.

The spelling of 618987 in words is "six hundred eighteen thousand, nine hundred eighty-seven".