42013640 has 32 divisors (see below), whose sum is σ = 98642880. Its totient is φ = 16074432.

The previous prime is 42013639. The next prime is 42013651. The reversal of 42013640 is 4631024.

It is a happy number.

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

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, 21914 + ... + 23753.

It is an arithmetic number, because the mean of its divisors is an integer number (3082590).

Almost surely, 2^42013640 is an apocalyptic number.

42013640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42013640 is an abundant number, since it is smaller than the sum of its proper divisors (56629240).

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

42013640 is a wasteful number, since it uses less digits than its factorization.

42013640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45701 (or 45697 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 42013640 is about 6481.7929618278. The cubic root of 42013640 is about 347.6402897837.

Adding to 42013640 its reverse (4631024), we get a palindrome (46644664).

The spelling of 42013640 in words is "forty-two million, thirteen thousand, six hundred forty".