7978747 has 8 divisors (see below), whose sum is σ = 9273600. Its totient is φ = 6722664.

The previous prime is 7978721. The next prime is 7978753. The reversal of 7978747 is 7478797.

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

It is a cyclic number.

It is not a de Polignac number, because 7978747 - 2¹⁵ = 7945979 is a prime.

7978747 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7978747.

It is not an unprimeable number, because it can be changed into a prime (7978757) 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, 9247 + ... + 10072.

It is an arithmetic number, because the mean of its divisors is an integer number (1159200).

Almost surely, 2^7978747 is an apocalyptic number.

7978747 is a deficient number, since it is larger than the sum of its proper divisors (1294853).

7978747 is a wasteful number, since it uses less digits than its factorization.

7978747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19385.

The product of its digits is 691488, while the sum is 49.

The square root of 7978747 is about 2824.6675910627. The cubic root of 7978747 is about 199.8227345980.

The spelling of 7978747 in words is "seven million, nine hundred seventy-eight thousand, seven hundred forty-seven".