26861969 has 4 divisors (see below), whose sum is σ = 26872560. Its totient is φ = 26851380.

The previous prime is 26861959. The next prime is 26861977. The reversal of 26861969 is 96916862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 26861969 - 2¹⁶ = 26796433 is a prime.

It is a super-2 number, since 2×26861969² = 1443130757113922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26861909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022 + ... + 7400.

It is an arithmetic number, because the mean of its divisors is an integer number (6718140).

Almost surely, 2^26861969 is an apocalyptic number.

It is an amenable number.

26861969 is a deficient number, since it is larger than the sum of its proper divisors (10591).

26861969 is an equidigital number, since it uses as much as digits as its factorization.

26861969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10590.

The product of its digits is 279936, while the sum is 47.

The square root of 26861969 is about 5182.8533647017. The cubic root of 26861969 is about 299.4879004182.

The spelling of 26861969 in words is "twenty-six million, eight hundred sixty-one thousand, nine hundred sixty-nine".