420560381 has 4 divisors (see below), whose sum is σ = 420628572. Its totient is φ = 420492192.

The previous prime is 420560377. The next prime is 420560423. The reversal of 420560381 is 183065024.

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 197655481 + 222904900 = 14059^2 + 14930^2 .

It is a cyclic number.

It is not a de Polignac number, because 420560381 - 2² = 420560377 is a prime.

It is a super-2 number, since 2×420560381² = 353742068133730322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420560341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23810 + ... + 37523.

It is an arithmetic number, because the mean of its divisors is an integer number (105157143).

Almost surely, 2^420560381 is an apocalyptic number.

It is an amenable number.

420560381 is a deficient number, since it is larger than the sum of its proper divisors (68191).

420560381 is an equidigital number, since it uses as much as digits as its factorization.

420560381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68190.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 420560381 is about 20507.5688710291. The cubic root of 420560381 is about 749.2201559239.

The spelling of 420560381 in words is "four hundred twenty million, five hundred sixty thousand, three hundred eighty-one".