420243890 has 48 divisors (see below), whose sum is σ = 847274904. Its totient is φ = 149909760.

The previous prime is 420243883. The next prime is 420243911. The reversal of 420243890 is 98342024.

It can be written as a sum of positive squares in 4 ways, for example, as 346816129 + 73427761 = 18623^2 + 8569^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60854 + ... + 67406.

Almost surely, 2^420243890 is an apocalyptic number.

420243890 is an abundant number, since it is smaller than the sum of its proper divisors (427031014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420243890 is a wasteful number, since it uses less digits than its factorization.

420243890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6635 (or 6624 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 420243890 is about 20499.8509750681. The cubic root of 420243890 is about 749.0321679016.

The spelling of 420243890 in words is "four hundred twenty million, two hundred forty-three thousand, eight hundred ninety".