618986 has 4 divisors (see below), whose sum is σ = 928482. Its totient is φ = 309492.

The previous prime is 618979. The next prime is 618991. The reversal of 618986 is 689816.

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

It can be written as a sum of positive squares in only one way, i.e., 609961 + 9025 = 781^2 + 95^2 .

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 as a sum of consecutive naturals, namely, 154745 + ... + 154748.

2⁶¹⁸⁹⁸⁶ is an apocalyptic number.

618986 is a deficient number, since it is larger than the sum of its proper divisors (309496).

618986 is a wasteful number, since it uses less digits than its factorization.

618986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309495.

The product of its digits is 20736, while the sum is 38.

The square root of 618986 is about 786.7566332736. The cubic root of 618986 is about 85.2236784607.

The spelling of 618986 in words is "six hundred eighteen thousand, nine hundred eighty-six".