40421040 has 160 divisors (see below), whose sum is σ = 139491072. Its totient is φ = 9600000.

The previous prime is 40421027. The next prime is 40421047. The reversal of 40421040 is 4012404.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40421047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160915 + ... + 161165.

Almost surely, 2^40421040 is an apocalyptic number.

40421040 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 40421040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69745536).

40421040 is an abundant number, since it is smaller than the sum of its proper divisors (99070032).

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

40421040 is a wasteful number, since it uses less digits than its factorization.

40421040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 40421040 is about 6357.7543205129. The cubic root of 40421040 is about 343.1909506908.

Adding to 40421040 its reverse (4012404), we get a palindrome (44433444).

The spelling of 40421040 in words is "forty million, four hundred twenty-one thousand, forty".