981493866 has 12 divisors (see below), whose sum is σ = 2126570082. Its totient is φ = 327164616.

The previous prime is 981493831. The next prime is 981493889. The reversal of 981493866 is 668394189.

981493866 is a `hidden beast` number, since 98 + 1 + 493 + 8 + 66 = 666.

It can be written as a sum of positive squares in only one way, i.e., 980003025 + 1490841 = 31305^2 + 1221^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27263701 + ... + 27263736.

Almost surely, 2^981493866 is an apocalyptic number.

981493866 is an abundant number, since it is smaller than the sum of its proper divisors (1145076216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981493866 is a wasteful number, since it uses less digits than its factorization.

981493866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54527445 (or 54527442 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 981493866 is about 31328.8024986593. The cubic root of 981493866 is about 993.7928395440.

The spelling of 981493866 in words is "nine hundred eighty-one million, four hundred ninety-three thousand, eight hundred sixty-six".