420440940 has 72 divisors (see below), whose sum is σ = 1350367200. Its totient is φ = 105521664.

The previous prime is 420440893. The next prime is 420440947. The reversal of 420440940 is 49044024.

It is not an unprimeable number, because it can be changed into a prime (420440947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65640 + ... + 71759.

It is an arithmetic number, because the mean of its divisors is an integer number (18755100).

Almost surely, 2^420440940 is an apocalyptic number.

It is an amenable number.

420440940 is an abundant number, since it is smaller than the sum of its proper divisors (929926260).

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

420440940 is a wasteful number, since it uses less digits than its factorization.

420440940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137431 (or 137426 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 420440940 is about 20504.6565443072. The cubic root of 420440940 is about 749.1492219338.

Adding to 420440940 its reverse (49044024), we get a palindrome (469484964).

The spelling of 420440940 in words is "four hundred twenty million, four hundred forty thousand, nine hundred forty".