26404421 has 8 divisors (see below), whose sum is σ = 27321240. Its totient is φ = 25498368.

The previous prime is 26404397. The next prime is 26404423. The reversal of 26404421 is 12440462.

It can be written as a sum of positive squares in 4 ways, for example, as 18395521 + 8008900 = 4289^2 + 2830^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26404421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26404423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2465 + ... + 7673.

It is an arithmetic number, because the mean of its divisors is an integer number (3415155).

Almost surely, 2^26404421 is an apocalyptic number.

It is an amenable number.

26404421 is a deficient number, since it is larger than the sum of its proper divisors (916819).

26404421 is a wasteful number, since it uses less digits than its factorization.

26404421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5383.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 26404421 is about 5138.5232314353. The cubic root of 26404421 is about 297.7777308988. Note that the first 4 decimals are identical.

Adding to 26404421 its reverse (12440462), we get a palindrome (38844883).

The spelling of 26404421 in words is "twenty-six million, four hundred four thousand, four hundred twenty-one".