4578921 has 12 divisors (see below), whose sum is σ = 6775860. Its totient is φ = 2977920.

The previous prime is 4578913. The next prime is 4578923. The reversal of 4578921 is 1298754.

It can be written as a sum of positive squares in 2 ways, for example, as 168921 + 4410000 = 411^2 + 2100^2 .

It is not a de Polignac number, because 4578921 - 2³ = 4578913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4578923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5836 + ... + 6573.

It is an arithmetic number, because the mean of its divisors is an integer number (564655).

Almost surely, 2^4578921 is an apocalyptic number.

4578921 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4578921 is a deficient number, since it is larger than the sum of its proper divisors (2196939).

4578921 is a wasteful number, since it uses less digits than its factorization.

4578921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12456 (or 12453 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 4578921 is about 2139.8413492593. The cubic root of 4578921 is about 166.0559278333.

The spelling of 4578921 in words is "four million, five hundred seventy-eight thousand, nine hundred twenty-one".