42240440 has 32 divisors (see below), whose sum is σ = 103682160. Its totient is φ = 15360000.

The previous prime is 42240433. The next prime is 42240463. The reversal of 42240440 is 4404224.

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

It is a congruent number.

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, 47561 + ... + 48440.

Almost surely, 2^42240440 is an apocalyptic number.

42240440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42240440 is an abundant number, since it is smaller than the sum of its proper divisors (61441720).

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

42240440 is a wasteful number, since it uses less digits than its factorization.

42240440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96023 (or 96019 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 42240440 is about 6499.2645737806. The cubic root of 42240440 is about 348.2647168910.

Adding to 42240440 its reverse (4404224), we get a palindrome (46644664).

The spelling of 42240440 in words is "forty-two million, two hundred forty thousand, four hundred forty".