26930981 has 8 divisors (see below), whose sum is σ = 33576384. Its totient is φ = 20985120.

The previous prime is 26930947. The next prime is 26930987. The reversal of 26930981 is 18903962.

26930981 = 606² + 607² + ... + 671².

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26930981 is a prime.

It is a super-2 number, since 2×26930981² = 1450555475244722, 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 (26930987) 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, 174800 + ... + 174953.

It is an arithmetic number, because the mean of its divisors is an integer number (4197048).

Almost surely, 2^26930981 is an apocalyptic number.

It is an amenable number.

26930981 is a deficient number, since it is larger than the sum of its proper divisors (6645403).

26930981 is a wasteful number, since it uses less digits than its factorization.

26930981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349771.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 26930981 is about 5189.5068166445. The cubic root of 26930981 is about 299.7441559488.

The spelling of 26930981 in words is "twenty-six million, nine hundred thirty thousand, nine hundred eighty-one".