4079921 has 4 divisors (see below), whose sum is σ = 4102644. Its totient is φ = 4057200.

The previous prime is 4079893. The next prime is 4079963. The reversal of 4079921 is 1299704.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 2768896 = 1145^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 4079921 - 2⁶ = 4079857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4079221) 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, 11090 + ... + 11451.

It is an arithmetic number, because the mean of its divisors is an integer number (1025661).

Almost surely, 2^4079921 is an apocalyptic number.

It is an amenable number.

4079921 is a deficient number, since it is larger than the sum of its proper divisors (22723).

4079921 is a wasteful number, since it uses less digits than its factorization.

4079921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22722.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 4079921 is about 2019.8814321638. The cubic root of 4079921 is about 159.7903634691.

The spelling of 4079921 in words is "four million, seventy-nine thousand, nine hundred twenty-one".