26391138 has 32 divisors (see below), whose sum is σ = 55256256. Its totient is φ = 8394048.

The previous prime is 26391119. The next prime is 26391139. The reversal of 26391138 is 83119362.

It is a junction number, because it is equal to n+sod(n) for n = 26391099 and 26391108.

It is not an unprimeable number, because it can be changed into a prime (26391139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10645 + ... + 12887.

It is an arithmetic number, because the mean of its divisors is an integer number (1726758).

Almost surely, 2^26391138 is an apocalyptic number.

26391138 is an abundant number, since it is smaller than the sum of its proper divisors (28865118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26391138 is a wasteful number, since it uses less digits than its factorization.

26391138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338.

The product of its digits is 7776, while the sum is 33.

The square root of 26391138 is about 5137.2305768770. The cubic root of 26391138 is about 297.7277891984.

The spelling of 26391138 in words is "twenty-six million, three hundred ninety-one thousand, one hundred thirty-eight".