4978891 has 4 divisors (see below), whose sum is σ = 4995112. Its totient is φ = 4962672.

The previous prime is 4978889. The next prime is 4978901. The reversal of 4978891 is 1988794.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4978891 - 2¹ = 4978889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4978801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7641 + ... + 8266.

It is an arithmetic number, because the mean of its divisors is an integer number (1248778).

Almost surely, 2^4978891 is an apocalyptic number.

4978891 is a deficient number, since it is larger than the sum of its proper divisors (16221).

4978891 is a wasteful number, since it uses less digits than its factorization.

4978891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16220.

The product of its digits is 145152, while the sum is 46.

The square root of 4978891 is about 2231.3428692158. The cubic root of 4978891 is about 170.7566160126.

The spelling of 4978891 in words is "four million, nine hundred seventy-eight thousand, eight hundred ninety-one".