420445240 has 32 divisors (see below), whose sum is σ = 946643760. Its totient is φ = 168064000.

The previous prime is 420445231. The next prime is 420445247. The reversal of 420445240 is 42544024.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420445247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80715 + ... + 85765.

Almost surely, 2^420445240 is an apocalyptic number.

420445240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420445240 is an abundant number, since it is smaller than the sum of its proper divisors (526198520).

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

420445240 is a wasteful number, since it uses less digits than its factorization.

420445240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143 (or 7139 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 420445240 is about 20504.7613982704. The cubic root of 420445240 is about 749.1517758642.

Adding to 420445240 its reverse (42544024), we get a palindrome (462989264).

The spelling of 420445240 in words is "four hundred twenty million, four hundred forty-five thousand, two hundred forty".