987984857 has 8 divisors (see below), whose sum is σ = 1041823200. Its totient is φ = 934330464.

The previous prime is 987984827. The next prime is 987984889. The reversal of 987984857 is 758489789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 987984857 - 2²² = 983790553 is a prime.

It is a super-2 number, since 2×987984857² = 1952228155322620898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 987984793 and 987984802.

It is not an unprimeable number, because it can be changed into a prime (987984827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34883 + ... + 56504.

It is an arithmetic number, because the mean of its divisors is an integer number (130227900).

Almost surely, 2^987984857 is an apocalyptic number.

It is an amenable number.

987984857 is a deficient number, since it is larger than the sum of its proper divisors (53838343).

987984857 is a wasteful number, since it uses less digits than its factorization.

987984857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91975.

The product of its digits is 40642560, while the sum is 65.

The square root of 987984857 is about 31432.2264085763. The cubic root of 987984857 is about 995.9788039903.

The spelling of 987984857 in words is "nine hundred eighty-seven million, nine hundred eighty-four thousand, eight hundred fifty-seven".