420140440 has 32 divisors (see below), whose sum is σ = 946781280. Its totient is φ = 167795712.

The previous prime is 420140419. The next prime is 420140459. The reversal of 420140440 is 44041024.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 19117 + ... + 34723.

It is an arithmetic number, because the mean of its divisors is an integer number (29586915).

Almost surely, 2^420140440 is an apocalyptic number.

420140440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420140440 is an abundant number, since it is smaller than the sum of its proper divisors (526640840).

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

420140440 is a wasteful number, since it uses less digits than its factorization.

420140440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16291 (or 16287 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 420140440 is about 20497.3276306937. The cubic root of 420140440 is about 748.9707006292.

Adding to 420140440 its reverse (44041024), we get a palindrome (464181464).

The spelling of 420140440 in words is "four hundred twenty million, one hundred forty thousand, four hundred forty".