7978253 has 8 divisors (see below), whose sum is σ = 8720640. Its totient is φ = 7266240.

The previous prime is 7978247. The next prime is 7978279. The reversal of 7978253 is 3528797.

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 7978253 - 2⁴ = 7978237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7978253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978753) 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, 7043 + ... + 8096.

It is an arithmetic number, because the mean of its divisors is an integer number (1090080).

Almost surely, 2^7978253 is an apocalyptic number.

It is an amenable number.

7978253 is a deficient number, since it is larger than the sum of its proper divisors (742387).

7978253 is a wasteful number, since it uses less digits than its factorization.

7978253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15187.

The product of its digits is 105840, while the sum is 41.

The square root of 7978253 is about 2824.5801457916. The cubic root of 7978253 is about 199.8186105391.

The spelling of 7978253 in words is "seven million, nine hundred seventy-eight thousand, two hundred fifty-three".