40421440 has 28 divisors (see below), whose sum is σ = 96254316. Its totient is φ = 16168448.

The previous prime is 40421413. The next prime is 40421443. The reversal of 40421440 is 4412404.

It can be written as a sum of positive squares in 2 ways, for example, as 8340544 + 32080896 = 2888^2 + 5664^2 .

It is not an unprimeable number, because it can be changed into a prime (40421443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62839 + ... + 63478.

Almost surely, 2^40421440 is an apocalyptic number.

40421440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40421440 is an abundant number, since it is smaller than the sum of its proper divisors (55832876).

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

40421440 is a wasteful number, since it uses less digits than its factorization.

40421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126334 (or 126324 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 40421440 is about 6357.7857780834. The cubic root of 40421440 is about 343.1920827409.

Adding to 40421440 its reverse (4412404), we get a palindrome (44833844).

The spelling of 40421440 in words is "forty million, four hundred twenty-one thousand, four hundred forty".