26440421 has 8 divisors (see below), whose sum is σ = 30375744. Its totient is φ = 22544640.

The previous prime is 26440391. The next prime is 26440429. The reversal of 26440421 is 12404462.

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-26440421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26440429) 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, 8435 + ... + 11136.

It is an arithmetic number, because the mean of its divisors is an integer number (3796968).

Almost surely, 2^26440421 is an apocalyptic number.

It is an amenable number.

26440421 is a deficient number, since it is larger than the sum of its proper divisors (3935323).

26440421 is a wasteful number, since it uses less digits than its factorization.

26440421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19771.

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

The square root of 26440421 is about 5142.0249902154. The cubic root of 26440421 is about 297.9130002928.

Adding to 26440421 its reverse (12404462), we get a palindrome (38844883).

The spelling of 26440421 in words is "twenty-six million, four hundred forty thousand, four hundred twenty-one".