7978653 has 6 divisors (see below), whose sum is σ = 11524734. Its totient is φ = 5319096.

The previous prime is 7978639. The next prime is 7978657. The reversal of 7978653 is 3568797.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7851204 + 127449 = 2802^2 + 357^2 .

It is not a de Polignac number, because 7978653 - 2⁴ = 7978637 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7978599 and 7978608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 443250 + ... + 443267.

It is an arithmetic number, because the mean of its divisors is an integer number (1920789).

Almost surely, 2^7978653 is an apocalyptic number.

It is an amenable number.

7978653 is a deficient number, since it is larger than the sum of its proper divisors (3546081).

7978653 is a wasteful number, since it uses less digits than its factorization.

7978653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886523 (or 886520 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 7978653 is about 2824.6509518877. The cubic root of 7978653 is about 199.8219498711.

The spelling of 7978653 in words is "seven million, nine hundred seventy-eight thousand, six hundred fifty-three".