83421987 has 8 divisors (see below), whose sum is σ = 121341120. Its totient is φ = 50558760.

The previous prime is 83421983. The next prime is 83422049. The reversal of 83421987 is 78912438.

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

It is not a de Polignac number, because 83421987 - 2² = 83421983 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (83421983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1263937 + ... + 1264002.

It is an arithmetic number, because the mean of its divisors is an integer number (15167640).

Almost surely, 2^83421987 is an apocalyptic number.

83421987 is a deficient number, since it is larger than the sum of its proper divisors (37919133).

83421987 is a wasteful number, since it uses less digits than its factorization.

83421987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527953.

The product of its digits is 96768, while the sum is 42.

The square root of 83421987 is about 9133.5637623000. The cubic root of 83421987 is about 436.9450696962.

The spelling of 83421987 in words is "eighty-three million, four hundred twenty-one thousand, nine hundred eighty-seven".