7983987 has 8 divisors (see below), whose sum is σ = 11613120. Its totient is φ = 4838760.

The previous prime is 7983979. The next prime is 7984001. The reversal of 7983987 is 7893897.

7983987 = 94² + 95² + ... + 291².

It is a happy number.

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

It is not a de Polignac number, because 7983987 - 2³ = 7983979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7983947) 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, 120937 + ... + 121002.

It is an arithmetic number, because the mean of its divisors is an integer number (1451640).

Almost surely, 2^7983987 is an apocalyptic number.

7983987 is a deficient number, since it is larger than the sum of its proper divisors (3629133).

7983987 is a wasteful number, since it uses less digits than its factorization.

7983987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241953.

The product of its digits is 762048, while the sum is 51.

The square root of 7983987 is about 2825.5949815924. The cubic root of 7983987 is about 199.8664692008.

The spelling of 7983987 in words is "seven million, nine hundred eighty-three thousand, nine hundred eighty-seven".