4478021 has 8 divisors (see below), whose sum is σ = 4765464. Its totient is φ = 4193280.

The previous prime is 4478017. The next prime is 4478059. The reversal of 4478021 is 1208744.

It can be written as a sum of positive squares in 4 ways, for example, as 3189796 + 1288225 = 1786^2 + 1135^2 .

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 4478021 - 2² = 4478017 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 (4478011) 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, 3551 + ... + 4643.

It is an arithmetic number, because the mean of its divisors is an integer number (595683).

Almost surely, 2^4478021 is an apocalyptic number.

It is an amenable number.

4478021 is a deficient number, since it is larger than the sum of its proper divisors (287443).

4478021 is a wasteful number, since it uses less digits than its factorization.

4478021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 4478021 is about 2116.1335024048. The cubic root of 4478021 is about 164.8271345374.

The spelling of 4478021 in words is "four million, four hundred seventy-eight thousand, twenty-one".