26387861 has 2 divisors, whose sum is σ = 26387862. Its totient is φ = 26387860.

The previous prime is 26387857. The next prime is 26387891. The reversal of 26387861 is 16878362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22800625 + 3587236 = 4775^2 + 1894^2 .

It is a cyclic number.

It is not a de Polignac number, because 26387861 - 2² = 26387857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26387891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13193930 + 13193931.

It is an arithmetic number, because the mean of its divisors is an integer number (13193931).

Almost surely, 2^26387861 is an apocalyptic number.

It is an amenable number.

26387861 is a deficient number, since it is larger than the sum of its proper divisors (1).

26387861 is an equidigital number, since it uses as much as digits as its factorization.

26387861 is an evil number, because the sum of its binary digits is even.

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

The square root of 26387861 is about 5136.9116208088. The cubic root of 26387861 is about 297.7154656885.

The spelling of 26387861 in words is "twenty-six million, three hundred eighty-seven thousand, eight hundred sixty-one".