26400257 has 4 divisors (see below), whose sum is σ = 28431060. Its totient is φ = 24369456.

The previous prime is 26400247. The next prime is 26400271. The reversal of 26400257 is 75200462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1560001 + 24840256 = 1249^2 + 4984^2 .

It is a cyclic number.

It is not a de Polignac number, because 26400257 - 2⁶ = 26400193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26400247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1015382 + ... + 1015407.

It is an arithmetic number, because the mean of its divisors is an integer number (7107765).

Almost surely, 2^26400257 is an apocalyptic number.

It is an amenable number.

26400257 is a deficient number, since it is larger than the sum of its proper divisors (2030803).

26400257 is a wasteful number, since it uses less digits than its factorization.

26400257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030802.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 26400257 is about 5138.1180406838. The cubic root of 26400257 is about 297.7620768074.

The spelling of 26400257 in words is "twenty-six million, four hundred thousand, two hundred fifty-seven".