104240391 has 4 divisors (see below), whose sum is σ = 138987192. Its totient is φ = 69493592.

The previous prime is 104240387. The next prime is 104240401. The reversal of 104240391 is 193042401.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 104240391 - 2² = 104240387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104240341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17373396 + ... + 17373401.

It is an arithmetic number, because the mean of its divisors is an integer number (34746798).

Almost surely, 2^104240391 is an apocalyptic number.

104240391 is a deficient number, since it is larger than the sum of its proper divisors (34746801).

104240391 is an equidigital number, since it uses as much as digits as its factorization.

104240391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34746800.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 104240391 is about 10209.8183627330. The cubic root of 104240391 is about 470.6289918693.

Adding to 104240391 its reverse (193042401), we get a palindrome (297282792).

The spelling of 104240391 in words is "one hundred four million, two hundred forty thousand, three hundred ninety-one".