7986478 has 4 divisors (see below), whose sum is σ = 11979720. Its totient is φ = 3993238.

The previous prime is 7986463. The next prime is 7986529. The reversal of 7986478 is 8746897.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996618 + ... + 1996621.

It is an arithmetic number, because the mean of its divisors is an integer number (2994930).

Almost surely, 2^7986478 is an apocalyptic number.

7986478 is a deficient number, since it is larger than the sum of its proper divisors (3993242).

7986478 is a wasteful number, since it uses less digits than its factorization.

7986478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993241.

The product of its digits is 677376, while the sum is 49.

The square root of 7986478 is about 2826.0357393352. The cubic root of 7986478 is about 199.8872531193.

It can be divided in two parts, 7986 and 478, that added together give a square (8464 = 92²).

The spelling of 7986478 in words is "seven million, nine hundred eighty-six thousand, four hundred seventy-eight".