26666397 has 6 divisors (see below), whose sum is σ = 38518142. Its totient is φ = 17777592.

The previous prime is 26666383. The next prime is 26666411. The reversal of 26666397 is 79366662.

It is an interprime number because it is at equal distance from previous prime (26666383) and next prime (26666411).

It can be written as a sum of positive squares in only one way, i.e., 25613721 + 1052676 = 5061^2 + 1026^2 .

It is not a de Polignac number, because 26666397 - 2¹¹ = 26664349 is a prime.

It is a super-2 number, since 2×26666397² = 1422193457923218, 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 (26666347) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1481458 + ... + 1481475.

Almost surely, 2^26666397 is an apocalyptic number.

It is an amenable number.

26666397 is a deficient number, since it is larger than the sum of its proper divisors (11851745).

26666397 is a wasteful number, since it uses less digits than its factorization.

26666397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2962939 (or 2962936 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The square root of 26666397 is about 5163.9516845145. The cubic root of 26666397 is about 298.7593093625.

The spelling of 26666397 in words is "twenty-six million, six hundred sixty-six thousand, three hundred ninety-seven".