478838791 has 2 divisors, whose sum is σ = 478838792. Its totient is φ = 478838790.

The previous prime is 478838777. The next prime is 478838821. The reversal of 478838791 is 197838874.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 478838791 - 2⁹ = 478838279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478830791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239419395 + 239419396.

It is an arithmetic number, because the mean of its divisors is an integer number (239419396).

Almost surely, 2^478838791 is an apocalyptic number.

478838791 is a deficient number, since it is larger than the sum of its proper divisors (1).

478838791 is an equidigital number, since it uses as much as digits as its factorization.

478838791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 55.

The square root of 478838791 is about 21882.3854047039. The cubic root of 478838791 is about 782.3416323547.

The spelling of 478838791 in words is "four hundred seventy-eight million, eight hundred thirty-eight thousand, seven hundred ninety-one".