83906987 has 4 divisors (see below), whose sum is σ = 86613696. Its totient is φ = 81200280.

The previous prime is 83906971. The next prime is 83906989. The reversal of 83906987 is 78960938.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 83906987 - 2⁴ = 83906971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83906989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1353308 + ... + 1353369.

It is an arithmetic number, because the mean of its divisors is an integer number (21653424).

Almost surely, 2^83906987 is an apocalyptic number.

83906987 is a deficient number, since it is larger than the sum of its proper divisors (2706709).

83906987 is a wasteful number, since it uses less digits than its factorization.

83906987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706708.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 83906987 is about 9160.0757092941. The cubic root of 83906987 is about 437.7902065841.

The spelling of 83906987 in words is "eighty-three million, nine hundred six thousand, nine hundred eighty-seven".