4778391 has 4 divisors (see below), whose sum is σ = 6371192. Its totient is φ = 3185592.

The previous prime is 4778387. The next prime is 4778399. The reversal of 4778391 is 1938774.

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

It is not a de Polignac number, because 4778391 - 2² = 4778387 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4778399) 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, 796396 + ... + 796401.

It is an arithmetic number, because the mean of its divisors is an integer number (1592798).

Almost surely, 2^4778391 is an apocalyptic number.

4778391 is a deficient number, since it is larger than the sum of its proper divisors (1592801).

4778391 is a wasteful number, since it uses less digits than its factorization.

4778391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592800.

The product of its digits is 42336, while the sum is 39.

The square root of 4778391 is about 2185.9531102016. The cubic root of 4778391 is about 168.4330170177.

It can be divided in two parts, 47783 and 91, that added together give a palindrome (47874).

The spelling of 4778391 in words is "four million, seven hundred seventy-eight thousand, three hundred ninety-one".