26985981 has 8 divisors (see below), whose sum is σ = 39252384. Its totient is φ = 16355120.

The previous prime is 26985929. The next prime is 26985989. The reversal of 26985981 is 18958962.

It is a happy number.

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 26985981 - 2⁷ = 26985853 is a prime.

It is a super-2 number, since 2×26985981² = 1456486341064722, which contains 22 as substring.

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 26985981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26985989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408846 + ... + 408911.

It is an arithmetic number, because the mean of its divisors is an integer number (4906548).

Almost surely, 2^26985981 is an apocalyptic number.

It is an amenable number.

26985981 is a deficient number, since it is larger than the sum of its proper divisors (12266403).

26985981 is a wasteful number, since it uses less digits than its factorization.

26985981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817771.

The product of its digits is 311040, while the sum is 48.

The square root of 26985981 is about 5194.8032686522. The cubic root of 26985981 is about 299.9480687888.

It can be divided in two parts, 26985 and 981, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 26985981 in words is "twenty-six million, nine hundred eighty-five thousand, nine hundred eighty-one".