40115321 has 4 divisors (see below), whose sum is σ = 40128000. Its totient is φ = 40102644.

The previous prime is 40115303. The next prime is 40115347. The reversal of 40115321 is 12351104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40115321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40115321.

It is not an unprimeable number, because it can be changed into a prime (40115351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2780 + ... + 9378.

It is an arithmetic number, because the mean of its divisors is an integer number (10032000).

Almost surely, 2^40115321 is an apocalyptic number.

It is an amenable number.

40115321 is a deficient number, since it is larger than the sum of its proper divisors (12679).

40115321 is an equidigital number, since it uses as much as digits as its factorization.

40115321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12678.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 40115321 is about 6333.6656842622. The cubic root of 40115321 is about 342.3235342219.

Adding to 40115321 its reverse (12351104), we get a palindrome (52466425).

The spelling of 40115321 in words is "forty million, one hundred fifteen thousand, three hundred twenty-one".