26389981 has 8 divisors (see below), whose sum is σ = 26700128. Its totient is φ = 26082000.

The previous prime is 26389963. The next prime is 26389997. The reversal of 26389981 is 18998362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26389981 - 2⁵ = 26389949 is a prime.

It is a super-2 number, since 2×26389981² = 1392862194360722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26389921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37846 + ... + 38536.

It is an arithmetic number, because the mean of its divisors is an integer number (3337516).

Almost surely, 2^26389981 is an apocalyptic number.

It is an amenable number.

26389981 is a deficient number, since it is larger than the sum of its proper divisors (310147).

26389981 is a wasteful number, since it uses less digits than its factorization.

26389981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083.

The product of its digits is 186624, while the sum is 46.

The square root of 26389981 is about 5137.1179663309. The cubic root of 26389981 is about 297.7234382923.

The spelling of 26389981 in words is "twenty-six million, three hundred eighty-nine thousand, nine hundred eighty-one".