40290321 has 8 divisors (see below), whose sum is σ = 53817120. Its totient is φ = 26811872.

The previous prime is 40290293. The next prime is 40290329. The reversal of 40290321 is 12309204.

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 40290321 - 2¹⁰ = 40289297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40290329) 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, 10095 + ... + 13508.

It is an arithmetic number, because the mean of its divisors is an integer number (6727140).

Almost surely, 2^40290321 is an apocalyptic number.

It is an amenable number.

40290321 is a deficient number, since it is larger than the sum of its proper divisors (13526799).

40290321 is a wasteful number, since it uses less digits than its factorization.

40290321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24175.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 40290321 is about 6347.4657147558. The cubic root of 40290321 is about 342.8205988084.

Adding to 40290321 its reverse (12309204), we get a palindrome (52599525).

The spelling of 40290321 in words is "forty million, two hundred ninety thousand, three hundred twenty-one".