420400402440 has 32 divisors (see below), whose sum is σ = 1261201207680. Its totient is φ = 112106773952.

The previous prime is 420400402421. The next prime is 420400402447. The reversal of 420400402440 is 44204004024.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 420400402440.

It is not an unprimeable number, because it can be changed into a prime (420400402447) by changing a digit.

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, 1751668224 + ... + 1751668463.

It is an arithmetic number, because the mean of its divisors is an integer number (39412537740).

Almost surely, 2^420400402440 is an apocalyptic number.

420400402440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420400402440 is an abundant number, since it is smaller than the sum of its proper divisors (840800805240).

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

420400402440 is a wasteful number, since it uses less digits than its factorization.

420400402440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503336701 (or 3503336697 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 420400402440 its reverse (44204004024), we get a palindrome (464604406464).

The spelling of 420400402440 in words is "four hundred twenty billion, four hundred million, four hundred two thousand, four hundred forty".