26399431 has 2 divisors, whose sum is σ = 26399432. Its totient is φ = 26399430.

The previous prime is 26399369. The next prime is 26399437. The reversal of 26399431 is 13499362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26399431 - 2¹¹ = 26397383 is a prime.

It is a super-2 number, since 2×26399431² = 1393859914247522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26399437) 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 as a sum of consecutive naturals, namely, 13199715 + 13199716.

It is an arithmetic number, because the mean of its divisors is an integer number (13199716).

Almost surely, 2^26399431 is an apocalyptic number.

26399431 is a deficient number, since it is larger than the sum of its proper divisors (1).

26399431 is an equidigital number, since it uses as much as digits as its factorization.

26399431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 37.

The square root of 26399431 is about 5138.0376604303. The cubic root of 26399431 is about 297.7589713573.

The spelling of 26399431 in words is "twenty-six million, three hundred ninety-nine thousand, four hundred thirty-one".