42907321 has 8 divisors (see below), whose sum is σ = 43467840. Its totient is φ = 42349968.

The previous prime is 42907307. The next prime is 42907357. The reversal of 42907321 is 12370924.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42907321 - 2⁵ = 42907289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42907321.

It is not an unprimeable number, because it can be changed into a prime (42907391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37855 + ... + 38971.

It is an arithmetic number, because the mean of its divisors is an integer number (5433480).

Almost surely, 2^42907321 is an apocalyptic number.

It is an amenable number.

42907321 is a deficient number, since it is larger than the sum of its proper divisors (560519).

42907321 is a wasteful number, since it uses less digits than its factorization.

42907321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 42907321 is about 6550.3680049292. The cubic root of 42907321 is about 350.0879262088.

It can be divided in two parts, 4290 and 7321, that added together give a palindrome (11611).

The spelling of 42907321 in words is "forty-two million, nine hundred seven thousand, three hundred twenty-one".