421403440 has 40 divisors (see below), whose sum is σ = 1002556368. Its totient is φ = 164640000.

The previous prime is 421403431. The next prime is 421403443. The reversal of 421403440 is 44304124.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (421403443) 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, 57811 + ... + 64690.

Almost surely, 2^421403440 is an apocalyptic number.

421403440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421403440 is an abundant number, since it is smaller than the sum of its proper divisors (581152928).

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

421403440 is a wasteful number, since it uses less digits than its factorization.

421403440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122557 (or 122551 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 421403440 is about 20528.1134057662. The cubic root of 421403440 is about 749.7204528545.

Adding to 421403440 its reverse (44304124), we get a palindrome (465707564).

It can be divided in two parts, 42140 and 3440, that multiplied together give a square (144961600 = 12040²).

The spelling of 421403440 in words is "four hundred twenty-one million, four hundred three thousand, four hundred forty".