987506405 has 24 divisors (see below), whose sum is σ = 1244477832. Its totient is φ = 752080896.

The previous prime is 987506389. The next prime is 987506447. The reversal of 987506405 is 504605789.

It can be written as a sum of positive squares in 12 ways, for example, as 28922884 + 958583521 = 5378^2 + 30961^2 .

It is not a de Polignac number, because 987506405 - 2⁴ = 987506389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 305357 + ... + 308573.

It is an arithmetic number, because the mean of its divisors is an integer number (51853243).

Almost surely, 2^987506405 is an apocalyptic number.

It is an amenable number.

987506405 is a deficient number, since it is larger than the sum of its proper divisors (256971427).

987506405 is a wasteful number, since it uses less digits than its factorization.

987506405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353 (or 3324 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 987506405 is about 31424.6146356642. The cubic root of 987506405 is about 995.8180036194.

The spelling of 987506405 in words is "nine hundred eighty-seven million, five hundred six thousand, four hundred five".