4021279 has 4 divisors (see below), whose sum is σ = 4037184. Its totient is φ = 4005376.

The previous prime is 4021261. The next prime is 4021301. The reversal of 4021279 is 9721204.

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

It is a cyclic number.

It is not a de Polignac number, because 4021279 - 2⁵ = 4021247 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 (4021229) 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, 7567 + ... + 8080.

It is an arithmetic number, because the mean of its divisors is an integer number (1009296).

Almost surely, 2^4021279 is an apocalyptic number.

4021279 is a deficient number, since it is larger than the sum of its proper divisors (15905).

4021279 is a wasteful number, since it uses less digits than its factorization.

4021279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15904.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 4021279 is about 2005.3126938211. The cubic root of 4021279 is about 159.0210934135.

It can be divided in two parts, 402 and 1279, that added together give a square (1681 = 41²).

The spelling of 4021279 in words is "four million, twenty-one thousand, two hundred seventy-nine".