26340721 has 4 divisors (see below), whose sum is σ = 28735344. Its totient is φ = 23946100.

The previous prime is 26340719. The next prime is 26340739. The reversal of 26340721 is 12704362.

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 26340721 - 2¹ = 26340719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26340751) 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, 1197295 + ... + 1197316.

It is an arithmetic number, because the mean of its divisors is an integer number (7183836).

Almost surely, 2^26340721 is an apocalyptic number.

It is an amenable number.

26340721 is a deficient number, since it is larger than the sum of its proper divisors (2394623).

26340721 is a wasteful number, since it uses less digits than its factorization.

26340721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394622.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 26340721 is about 5132.3212097452. The cubic root of 26340721 is about 297.5380776533.

The spelling of 26340721 in words is "twenty-six million, three hundred forty thousand, seven hundred twenty-one".