15440791 has 4 divisors (see below), whose sum is σ = 15483232. Its totient is φ = 15398352.

The previous prime is 15440773. The next prime is 15440809. The reversal of 15440791 is 19704451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19704451 = 13 ⋅1515727.

It is an interprime number because it is at equal distance from previous prime (15440773) and next prime (15440809).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15440791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15440701) 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, 20670 + ... + 21403.

It is an arithmetic number, because the mean of its divisors is an integer number (3870808).

Almost surely, 2^15440791 is an apocalyptic number.

15440791 is a deficient number, since it is larger than the sum of its proper divisors (42441).

15440791 is an equidigital number, since it uses as much as digits as its factorization.

15440791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42440.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 15440791 is about 3929.4771916885. The cubic root of 15440791 is about 249.0136656962.

The spelling of 15440791 in words is "fifteen million, four hundred forty thousand, seven hundred ninety-one".