420856919 has 4 divisors (see below), whose sum is σ = 480979344. Its totient is φ = 360734496.

The previous prime is 420856823. The next prime is 420856939. The reversal of 420856919 is 919658024.

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

It is a cyclic number.

It is not a de Polignac number, because 420856919 - 2¹⁶ = 420791383 is a prime.

It is a super-2 number, since 2×420856919² = 354241092540345122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420856919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420856939) 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, 30061202 + ... + 30061215.

It is an arithmetic number, because the mean of its divisors is an integer number (120244836).

Almost surely, 2^420856919 is an apocalyptic number.

420856919 is a deficient number, since it is larger than the sum of its proper divisors (60122425).

420856919 is an equidigital number, since it uses as much as digits as its factorization.

420856919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60122424.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 420856919 is about 20514.7975617601. The cubic root of 420856919 is about 749.3962067829.

The spelling of 420856919 in words is "four hundred twenty million, eight hundred fifty-six thousand, nine hundred nineteen".