4978621 has 4 divisors (see below), whose sum is σ = 5011744. Its totient is φ = 4945500.

The previous prime is 4978607. The next prime is 4978651. The reversal of 4978621 is 1268794.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1268794 = 2 ⋅634397.

It is a cyclic number.

It is not a de Polignac number, because 4978621 - 2⁹ = 4978109 is a prime.

It is an Ulam number.

It is a Duffinian number.

4978621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4978651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16335 + ... + 16636.

It is an arithmetic number, because the mean of its divisors is an integer number (1252936).

Almost surely, 2^4978621 is an apocalyptic number.

It is an amenable number.

4978621 is a deficient number, since it is larger than the sum of its proper divisors (33123).

4978621 is a wasteful number, since it uses less digits than its factorization.

4978621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33122.

The product of its digits is 24192, while the sum is 37.

The square root of 4978621 is about 2231.2823667120. The cubic root of 4978621 is about 170.7535293065.

The spelling of 4978621 in words is "four million, nine hundred seventy-eight thousand, six hundred twenty-one".