42236640 has 120 divisors (see below), whose sum is σ = 149105880. Its totient is φ = 11259648.

The previous prime is 42236617. The next prime is 42236657. The reversal of 42236640 is 4663224.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 11331 + ... + 14589.

It is an arithmetic number, because the mean of its divisors is an integer number (1242549).

Almost surely, 2^42236640 is an apocalyptic number.

42236640 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 42236640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74552940).

42236640 is an abundant number, since it is smaller than the sum of its proper divisors (106869240).

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

42236640 is a wasteful number, since it uses less digits than its factorization.

42236640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3286 (or 3269 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 42236640 is about 6498.9722264370. The cubic root of 42236640 is about 348.2542731424.

Adding to 42236640 its reverse (4663224), we get a palindrome (46899864).

The spelling of 42236640 in words is "forty-two million, two hundred thirty-six thousand, six hundred forty".