7987812 has 24 divisors (see below), whose sum is σ = 21301056. Its totient is φ = 2282208.

The previous prime is 7987799. The next prime is 7987813. The reversal of 7987812 is 2187897.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an Ulam number.

It is a d-powerful number, because it can be written as 7⁶ + 9 + 8 + 7⁸ + 8⁷ + 1 + 2¹³ .

It is not an unprimeable number, because it can be changed into a prime (7987813) 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, 47463 + ... + 47630.

It is an arithmetic number, because the mean of its divisors is an integer number (887544).

Almost surely, 2^7987812 is an apocalyptic number.

It is an amenable number.

7987812 is an abundant number, since it is smaller than the sum of its proper divisors (13313244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7987812 is a wasteful number, since it uses less digits than its factorization.

7987812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95107 (or 95105 counting only the distinct ones).

The product of its digits is 56448, while the sum is 42.

The square root of 7987812 is about 2826.2717491423. The cubic root of 7987812 is about 199.8983817107.

The spelling of 7987812 in words is "seven million, nine hundred eighty-seven thousand, eight hundred twelve".