420440019 has 4 divisors (see below), whose sum is σ = 560586696. Its totient is φ = 280293344.

The previous prime is 420440003. The next prime is 420440047. The reversal of 420440019 is 910044024.

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 420440019 - 2⁴ = 420440003 is a prime.

It is a super-2 number, since 2×420440019² = 353539619153440722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (420440089) 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, 70073334 + ... + 70073339.

It is an arithmetic number, because the mean of its divisors is an integer number (140146674).

Almost surely, 2^420440019 is an apocalyptic number.

420440019 is a deficient number, since it is larger than the sum of its proper divisors (140146677).

420440019 is a wasteful number, since it uses less digits than its factorization.

420440019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140146676.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 420440019 is about 20504.6340859816. The cubic root of 420440019 is about 749.1486749153.

The spelling of 420440019 in words is "four hundred twenty million, four hundred forty thousand, nineteen".