478238389 has 4 divisors (see below), whose sum is σ = 489360256. Its totient is φ = 467116524.

The previous prime is 478238377. The next prime is 478238413. The reversal of 478238389 is 983832874.

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 478238389 - 2²⁵ = 444683957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478238359) 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, 5560869 + ... + 5560954.

It is an arithmetic number, because the mean of its divisors is an integer number (122340064).

Almost surely, 2^478238389 is an apocalyptic number.

It is an amenable number.

478238389 is a deficient number, since it is larger than the sum of its proper divisors (11121867).

478238389 is a wasteful number, since it uses less digits than its factorization.

478238389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11121866.

The product of its digits is 2322432, while the sum is 52.

The square root of 478238389 is about 21868.6622590409. The cubic root of 478238389 is about 782.0145104722.

The spelling of 478238389 in words is "four hundred seventy-eight million, two hundred thirty-eight thousand, three hundred eighty-nine".