26391977 has 4 divisors (see below), whose sum is σ = 26524800. Its totient is φ = 26259156.

The previous prime is 26391947. The next prime is 26391983. The reversal of 26391977 is 77919362.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77919362 = 2 ⋅38959681.

It is a cyclic number.

It is not a de Polignac number, because 26391977 - 2¹⁴ = 26375593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26391917) 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 3 ways as a sum of consecutive naturals, for example, 66113 + ... + 66510.

It is an arithmetic number, because the mean of its divisors is an integer number (6631200).

Almost surely, 2^26391977 is an apocalyptic number.

It is an amenable number.

26391977 is a deficient number, since it is larger than the sum of its proper divisors (132823).

26391977 is a wasteful number, since it uses less digits than its factorization.

26391977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132822.

The product of its digits is 142884, while the sum is 44.

The square root of 26391977 is about 5137.3122350116. The cubic root of 26391977 is about 297.7309441838.

The spelling of 26391977 in words is "twenty-six million, three hundred ninety-one thousand, nine hundred seventy-seven".