420547385 has 4 divisors (see below), whose sum is σ = 504656868. Its totient is φ = 336437904.

The previous prime is 420547381. The next prime is 420547417. The reversal of 420547385 is 583745024.

It is a happy number.

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 185477161 + 235070224 = 13619^2 + 15332^2 .

It is a cyclic number.

It is not a de Polignac number, because 420547385 - 2² = 420547381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420547381) 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, 42054734 + ... + 42054743.

It is an arithmetic number, because the mean of its divisors is an integer number (126164217).

Almost surely, 2^420547385 is an apocalyptic number.

It is an amenable number.

420547385 is a deficient number, since it is larger than the sum of its proper divisors (84109483).

420547385 is an equidigital number, since it uses as much as digits as its factorization.

420547385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84109482.

The product of its (nonzero) digits is 134400, while the sum is 38.

The square root of 420547385 is about 20507.2520099598. The cubic root of 420547385 is about 749.2124384704.

The spelling of 420547385 in words is "four hundred twenty million, five hundred forty-seven thousand, three hundred eighty-five".