7866887 has 4 divisors (see below), whose sum is σ = 8990736. Its totient is φ = 6743040.

The previous prime is 7866863. The next prime is 7866889. The reversal of 7866887 is 7886687.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7866887 is a prime.

It is a super-2 number, since 2×7866887² = 123775822141538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7866889) 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, 561914 + ... + 561927.

It is an arithmetic number, because the mean of its divisors is an integer number (2247684).

Almost surely, 2^7866887 is an apocalyptic number.

7866887 is a deficient number, since it is larger than the sum of its proper divisors (1123849).

7866887 is a wasteful number, since it uses less digits than its factorization.

7866887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123848.

The product of its digits is 903168, while the sum is 50.

The square root of 7866887 is about 2804.7971406146. The cubic root of 7866887 is about 198.8845150332.

The spelling of 7866887 in words is "seven million, eight hundred sixty-six thousand, eight hundred eighty-seven".