15941993 has 4 divisors (see below), whose sum is σ = 16024788. Its totient is φ = 15859200.

The previous prime is 15941951. The next prime is 15941999. The reversal of 15941993 is 39914951.

15941993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39914951 = 163 ⋅244877.

It can be written as a sum of positive squares in 2 ways, for example, as 4129024 + 11812969 = 2032^2 + 3437^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15941993 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 15941993.

It is not an unprimeable number, because it can be changed into a prime (15941999) 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, 41108 + ... + 41493.

It is an arithmetic number, because the mean of its divisors is an integer number (4006197).

Almost surely, 2^15941993 is an apocalyptic number.

It is an amenable number.

15941993 is a deficient number, since it is larger than the sum of its proper divisors (82795).

15941993 is an equidigital number, since it uses as much as digits as its factorization.

15941993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82794.

The product of its digits is 43740, while the sum is 41.

The square root of 15941993 is about 3992.7425411614. The cubic root of 15941993 is about 251.6793235646.

The spelling of 15941993 in words is "fifteen million, nine hundred forty-one thousand, nine hundred ninety-three".