4978721 has 4 divisors (see below), whose sum is σ = 5431344. Its totient is φ = 4526100.

The previous prime is 4978709. The next prime is 4978723. The reversal of 4978721 is 1278794.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4978721 - 2⁶ = 4978657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4978723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226295 + ... + 226316.

It is an arithmetic number, because the mean of its divisors is an integer number (1357836).

Almost surely, 2^4978721 is an apocalyptic number.

It is an amenable number.

4978721 is a deficient number, since it is larger than the sum of its proper divisors (452623).

4978721 is a wasteful number, since it uses less digits than its factorization.

4978721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452622.

The product of its digits is 28224, while the sum is 38.

The square root of 4978721 is about 2231.3047752380. The cubic root of 4978721 is about 170.7546725439.

The spelling of 4978721 in words is "four million, nine hundred seventy-eight thousand, seven hundred twenty-one".