26890421 has 4 divisors (see below), whose sum is σ = 26908992. Its totient is φ = 26871852.

The previous prime is 26890417. The next prime is 26890433. The reversal of 26890421 is 12409862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26890421 - 2² = 26890417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26890411) 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, 6911 + ... + 10076.

It is an arithmetic number, because the mean of its divisors is an integer number (6727248).

Almost surely, 2^26890421 is an apocalyptic number.

It is an amenable number.

26890421 is a deficient number, since it is larger than the sum of its proper divisors (18571).

26890421 is a wasteful number, since it uses less digits than its factorization.

26890421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18570.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 26890421 is about 5185.5974583456. The cubic root of 26890421 is about 299.5936015682.

The spelling of 26890421 in words is "twenty-six million, eight hundred ninety thousand, four hundred twenty-one".