420440819 has 4 divisors (see below), whose sum is σ = 423118944. Its totient is φ = 417762696.

The previous prime is 420440809. The next prime is 420440827. The reversal of 420440819 is 918044024.

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 420440819 - 2²⁸ = 152005363 is a prime.

It is a super-2 number, since 2×420440819² = 353540964562781522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420440809) 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, 1338827 + ... + 1339140.

It is an arithmetic number, because the mean of its divisors is an integer number (105779736).

Almost surely, 2^420440819 is an apocalyptic number.

420440819 is a deficient number, since it is larger than the sum of its proper divisors (2678125).

420440819 is a wasteful number, since it uses less digits than its factorization.

420440819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678124.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 420440819 is about 20504.6535937577. The cubic root of 420440819 is about 749.1491500672.

The spelling of 420440819 in words is "four hundred twenty million, four hundred forty thousand, eight hundred nineteen".