987653421 has 12 divisors (see below), whose sum is σ = 1501695520. Its totient is φ = 623781000.

The previous prime is 987653417. The next prime is 987653449. The reversal of 987653421 is 124356789.

987653421 is a `hidden beast` number, since 98 + 7 + 6 + 534 + 21 = 666.

It is not a de Polignac number, because 987653421 - 2² = 987653417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987653411) 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, 2887705 + ... + 2888046.

Almost surely, 2^987653421 is an apocalyptic number.

It is an amenable number.

987653421 is a deficient number, since it is larger than the sum of its proper divisors (514042099).

987653421 is a wasteful number, since it uses less digits than its factorization.

987653421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5775776 (or 5775773 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 987653421 is about 31426.9537340163. The cubic root of 987653421 is about 995.8674189664.

The spelling of 987653421 in words is "nine hundred eighty-seven million, six hundred fifty-three thousand, four hundred twenty-one".