26400631 has 2 divisors, whose sum is σ = 26400632. Its totient is φ = 26400630.

The previous prime is 26400629. The next prime is 26400653. The reversal of 26400631 is 13600462.

It is an a-pointer prime, because the next prime (26400653) can be obtained adding 26400631 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26400631 - 2¹ = 26400629 is a prime.

It is a super-2 number, since 2×26400631² = 1393986634396322, which contains 22 as substring.

Together with 26400629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26400601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13200315 + 13200316.

It is an arithmetic number, because the mean of its divisors is an integer number (13200316).

Almost surely, 2^26400631 is an apocalyptic number.

26400631 is a deficient number, since it is larger than the sum of its proper divisors (1).

26400631 is an equidigital number, since it uses as much as digits as its factorization.

26400631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 26400631 is about 5138.1544352034. The cubic root of 26400631 is about 297.7634828858.

The spelling of 26400631 in words is "twenty-six million, four hundred thousand, six hundred thirty-one".