421540040 has 32 divisors (see below), whose sum is σ = 949250880. Its totient is φ = 168476352.

The previous prime is 421540037. The next prime is 421540069. The reversal of 421540040 is 40045124.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 421539994 and 421540021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54239 + ... + 61521.

It is an arithmetic number, because the mean of its divisors is an integer number (29664090).

Almost surely, 2^421540040 is an apocalyptic number.

421540040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421540040 is an abundant number, since it is smaller than the sum of its proper divisors (527710840).

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

421540040 is a wasteful number, since it uses less digits than its factorization.

421540040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8741 (or 8737 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 421540040 is about 20531.4402807012. The cubic root of 421540040 is about 749.8014526284.

Adding to 421540040 its reverse (40045124), we get a palindrome (461585164).

The spelling of 421540040 in words is "four hundred twenty-one million, five hundred forty thousand, forty".