987946891 has 8 divisors (see below), whose sum is σ = 1050442560. Its totient is φ = 925938048.

The previous prime is 987946877. The next prime is 987946913. The reversal of 987946891 is 198649789.

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

It is not a de Polignac number, because 987946891 - 2⁵ = 987946859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987946391) 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, 117516 + ... + 125641.

It is an arithmetic number, because the mean of its divisors is an integer number (131305320).

Almost surely, 2^987946891 is an apocalyptic number.

987946891 is a deficient number, since it is larger than the sum of its proper divisors (62495669).

987946891 is a wasteful number, since it uses less digits than its factorization.

987946891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243413.

The product of its digits is 7838208, while the sum is 61.

The square root of 987946891 is about 31431.6224684632. The cubic root of 987946891 is about 995.9660460971.

The spelling of 987946891 in words is "nine hundred eighty-seven million, nine hundred forty-six thousand, eight hundred ninety-one".