26231409 has 18 divisors (see below), whose sum is σ = 38959830. Its totient is φ = 17006976.

The previous prime is 26231393. The next prime is 26231423. The reversal of 26231409 is 90413262.

26231409 is a `hidden beast` number, since 26 + 231 + 409 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 11370384 + 14861025 = 3372^2 + 3855^2 .

It is not a de Polignac number, because 26231409 - 2⁴ = 26231393 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (26231489) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11257 + ... + 13385.

It is an arithmetic number, because the mean of its divisors is an integer number (2164435).

Almost surely, 2^26231409 is an apocalyptic number.

26231409 is the 2738-th nonagonal number.

It is an amenable number.

26231409 is a deficient number, since it is larger than the sum of its proper divisors (12728421).

26231409 is a wasteful number, since it uses less digits than its factorization.

26231409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209 (or 2169 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 26231409 is about 5121.6607658063. The cubic root of 26231409 is about 297.1259201458.

The spelling of 26231409 in words is "twenty-six million, two hundred thirty-one thousand, four hundred nine".