421240040 has 64 divisors (see below), whose sum is σ = 1044489600. Its totient is φ = 151909632.

The previous prime is 421240037. The next prime is 421240069. The reversal of 421240040 is 40042124.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12941 + ... + 31779.

It is an arithmetic number, because the mean of its divisors is an integer number (16320150).

Almost surely, 2^421240040 is an apocalyptic number.

421240040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421240040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (522244800).

421240040 is an abundant number, since it is smaller than the sum of its proper divisors (623249560).

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

421240040 is a wasteful number, since it uses less digits than its factorization.

421240040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18906 (or 18902 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 421240040 is about 20524.1331120221. The cubic root of 421240040 is about 749.6235384747.

Adding to 421240040 its reverse (40042124), we get a palindrome (461282164).

The spelling of 421240040 in words is "four hundred twenty-one million, two hundred forty thousand, forty".