26406721 has 8 divisors (see below), whose sum is σ = 28864800. Its totient is φ = 23958240.

The previous prime is 26406707. The next prime is 26406727. The reversal of 26406721 is 12760462.

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

It is a cyclic number.

It is not a de Polignac number, because 26406721 - 2¹¹ = 26404673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26406721.

It is not an unprimeable number, because it can be changed into a prime (26406727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4150 + ... + 8368.

It is an arithmetic number, because the mean of its divisors is an integer number (3608100).

Almost surely, 2^26406721 is an apocalyptic number.

It is an amenable number.

26406721 is a deficient number, since it is larger than the sum of its proper divisors (2458079).

26406721 is a wasteful number, since it uses less digits than its factorization.

26406721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4799.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 26406721 is about 5138.7470262701. The cubic root of 26406721 is about 297.7863767855.

The spelling of 26406721 in words is "twenty-six million, four hundred six thousand, seven hundred twenty-one".