987435981 has 16 divisors (see below), whose sum is σ = 1671849600. Its totient is φ = 564249024.

The previous prime is 987435881. The next prime is 987435991. The reversal of 987435981 is 189534789.

987435981 is a `hidden beast` number, since 9 + 8 + 7 + 43 + 598 + 1 = 666.

It is not a de Polignac number, because 987435981 - 2¹⁷ = 987304909 is a prime.

It is a super-2 number, since 2×987435981² = 1950059633146864722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987435991) 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, 2612076 + ... + 2612453.

It is an arithmetic number, because the mean of its divisors is an integer number (104490600).

Almost surely, 2^987435981 is an apocalyptic number.

It is an amenable number.

987435981 is a deficient number, since it is larger than the sum of its proper divisors (684413619).

987435981 is a wasteful number, since it uses less digits than its factorization.

987435981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5224545 (or 5224539 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 987435981 is about 31423.4940927962. The cubic root of 987435981 is about 995.7943308095.

The spelling of 987435981 in words is "nine hundred eighty-seven million, four hundred thirty-five thousand, nine hundred eighty-one".