4278421 has 8 divisors (see below), whose sum is σ = 5022080. Its totient is φ = 3567888.

The previous prime is 4278413. The next prime is 4278431. The reversal of 4278421 is 1248724.

4278421 = 203² + 204² + ... + 276².

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 4278421 - 2³ = 4278413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4278421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4278431) 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, 8001 + ... + 8518.

It is an arithmetic number, because the mean of its divisors is an integer number (627760).

Almost surely, 2^4278421 is an apocalyptic number.

It is an amenable number.

4278421 is a deficient number, since it is larger than the sum of its proper divisors (743659).

4278421 is a wasteful number, since it uses less digits than its factorization.

4278421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16563.

The product of its digits is 3584, while the sum is 28.

The square root of 4278421 is about 2068.4344321249. The cubic root of 4278421 is about 162.3408587947.

The spelling of 4278421 in words is "four million, two hundred seventy-eight thousand, four hundred twenty-one".