8021279 has 4 divisors (see below), whose sum is σ = 9167184. Its totient is φ = 6875376.

The previous prime is 8021269. The next prime is 8021291. The reversal of 8021279 is 9721208.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8021279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8021239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 572942 + ... + 572955.

It is an arithmetic number, because the mean of its divisors is an integer number (2291796).

Almost surely, 2^8021279 is an apocalyptic number.

8021279 is a deficient number, since it is larger than the sum of its proper divisors (1145905).

8021279 is a wasteful number, since it uses less digits than its factorization.

8021279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145904.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 8021279 is about 2832.1862579993. The cubic root of 8021279 is about 200.1771680111.

The spelling of 8021279 in words is "eight million, twenty-one thousand, two hundred seventy-nine".