8120987 has 4 divisors (see below), whose sum is σ = 9281136. Its totient is φ = 6960840.

The previous prime is 8120953. The next prime is 8121011. The reversal of 8120987 is 7890218.

It is a happy number.

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 8120987 - 2⁸ = 8120731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8120687) 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, 580064 + ... + 580077.

It is an arithmetic number, because the mean of its divisors is an integer number (2320284).

Almost surely, 2^8120987 is an apocalyptic number.

8120987 is a deficient number, since it is larger than the sum of its proper divisors (1160149).

8120987 is a wasteful number, since it uses less digits than its factorization.

8120987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160148.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 8120987 is about 2849.7345490414. The cubic root of 8120987 is about 201.0031846892.

The spelling of 8120987 in words is "eight million, one hundred twenty thousand, nine hundred eighty-seven".