26390997 has 12 divisors (see below), whose sum is σ = 38499084. Its totient is φ = 17419200.

The previous prime is 26390989. The next prime is 26390999. The reversal of 26390997 is 79909362.

26390997 is a `hidden beast` number, since 2 + 639 + 0 + 9 + 9 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18740241 + 7650756 = 4329^2 + 2766^2 .

It is not a de Polignac number, because 26390997 - 2³ = 26390989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26390999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13608 + ... + 15425.

It is an arithmetic number, because the mean of its divisors is an integer number (3208257).

Almost surely, 2^26390997 is an apocalyptic number.

It is an amenable number.

26390997 is a deficient number, since it is larger than the sum of its proper divisors (12108087).

26390997 is a wasteful number, since it uses less digits than its factorization.

26390997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29140 (or 29137 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 26390997 is about 5137.2168535112. The cubic root of 26390997 is about 297.7272589737.

The spelling of 26390997 in words is "twenty-six million, three hundred ninety thousand, nine hundred ninety-seven".