618989894 has 4 divisors (see below), whose sum is σ = 928484844. Its totient is φ = 309494946.

The previous prime is 618989893. The next prime is 618989911. The reversal of 618989894 is 498989816.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618989893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154747472 + ... + 154747475.

It is an arithmetic number, because the mean of its divisors is an integer number (232121211).

Almost surely, 2^618989894 is an apocalyptic number.

618989894 is a deficient number, since it is larger than the sum of its proper divisors (309494950).

618989894 is a wasteful number, since it uses less digits than its factorization.

618989894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309494949.

The product of its digits is 8957952, while the sum is 62.

The square root of 618989894 is about 24879.5075112029. The cubic root of 618989894 is about 852.2385717248.

The spelling of 618989894 in words is "six hundred eighteen million, nine hundred eighty-nine thousand, eight hundred ninety-four".