26147993 has 4 divisors (see below), whose sum is σ = 26347728. Its totient is φ = 25948260.

The previous prime is 26147981. The next prime is 26148019. The reversal of 26147993 is 39974162.

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 an emirpimes, since its reverse is a distinct semiprime: 39974162 = 2 ⋅19987081.

It is a cyclic number.

It is not a de Polignac number, because 26147993 - 2⁶ = 26147929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26147993.

It is not an unprimeable number, because it can be changed into a prime (26147923) 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, 99671 + ... + 99932.

It is an arithmetic number, because the mean of its divisors is an integer number (6586932).

Almost surely, 2^26147993 is an apocalyptic number.

It is an amenable number.

26147993 is a deficient number, since it is larger than the sum of its proper divisors (199735).

26147993 is a wasteful number, since it uses less digits than its factorization.

26147993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199734.

The product of its digits is 81648, while the sum is 41.

The square root of 26147993 is about 5113.5108291662. The cubic root of 26147993 is about 296.8106317770.

The spelling of 26147993 in words is "twenty-six million, one hundred forty-seven thousand, nine hundred ninety-three".