26447981 has 16 divisors (see below), whose sum is σ = 32501760. Its totient is φ = 21014640.

The previous prime is 26447977. The next prime is 26448011. The reversal of 26447981 is 18974462.

It is not a de Polignac number, because 26447981 - 2² = 26447977 is a prime.

It is a super-2 number, since 2×26447981² = 1398991397952722, 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 (26447951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4136 + ... + 8366.

It is an arithmetic number, because the mean of its divisors is an integer number (2031360).

Almost surely, 2^26447981 is an apocalyptic number.

It is an amenable number.

26447981 is a deficient number, since it is larger than the sum of its proper divisors (6053779).

26447981 is a wasteful number, since it uses less digits than its factorization.

26447981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4304.

The product of its digits is 96768, while the sum is 41.

The square root of 26447981 is about 5142.7600566233. The cubic root of 26447981 is about 297.9413912636.

The spelling of 26447981 in words is "twenty-six million, four hundred forty-seven thousand, nine hundred eighty-one".