418728385 has 4 divisors (see below), whose sum is σ = 502474068. Its totient is φ = 334982704.

The previous prime is 418728383. The next prime is 418728397. The reversal of 418728385 is 583827814.

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

It can be written as a sum of positive squares in 2 ways, for example, as 291760561 + 126967824 = 17081^2 + 11268^2 .

It is a cyclic number.

It is not a de Polignac number, because 418728385 - 2¹ = 418728383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (418728383) 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, 41872834 + ... + 41872843.

It is an arithmetic number, because the mean of its divisors is an integer number (125618517).

Almost surely, 2^418728385 is an apocalyptic number.

It is an amenable number.

418728385 is a deficient number, since it is larger than the sum of its proper divisors (83745683).

418728385 is an equidigital number, since it uses as much as digits as its factorization.

418728385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83745682.

The product of its digits is 430080, while the sum is 46.

The square root of 418728385 is about 20462.8537843576. The cubic root of 418728385 is about 748.1306840070.

The spelling of 418728385 in words is "four hundred eighteen million, seven hundred twenty-eight thousand, three hundred eighty-five".