987459021 has 12 divisors (see below), whose sum is σ = 1431882972. Its totient is φ = 655742976.

The previous prime is 987459017. The next prime is 987459029. The reversal of 987459021 is 120954789.

It can be written as a sum of positive squares in 2 ways, for example, as 743162121 + 244296900 = 27261^2 + 15630^2 .

It is not a de Polignac number, because 987459021 - 2² = 987459017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987459029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211146 + ... + 215771.

It is an arithmetic number, because the mean of its divisors is an integer number (119323581).

Almost surely, 2^987459021 is an apocalyptic number.

It is an amenable number.

987459021 is a deficient number, since it is larger than the sum of its proper divisors (444423951).

987459021 is a wasteful number, since it uses less digits than its factorization.

987459021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427180 (or 427177 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 987459021 is about 31423.8606953379. The cubic root of 987459021 is about 995.8020757581.

The spelling of 987459021 in words is "nine hundred eighty-seven million, four hundred fifty-nine thousand, twenty-one".