26156421 has 12 divisors (see below), whose sum is σ = 40004172. Its totient is φ = 16411776.

The previous prime is 26156363. The next prime is 26156437. The reversal of 26156421 is 12465162.

26156421 is a `hidden beast` number, since 2 + 6 + 15 + 642 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8767521 + 17388900 = 2961^2 + 4170^2 .

It is not a de Polignac number, because 26156421 - 2¹³ = 26148229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26156441) 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 11 ways as a sum of consecutive naturals, for example, 85326 + ... + 85631.

It is an arithmetic number, because the mean of its divisors is an integer number (3333681).

Almost surely, 2^26156421 is an apocalyptic number.

It is an amenable number.

26156421 is a deficient number, since it is larger than the sum of its proper divisors (13847751).

26156421 is a wasteful number, since it uses less digits than its factorization.

26156421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170980 (or 170977 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 26156421 is about 5114.3348541135. The cubic root of 26156421 is about 296.8425176058.

The spelling of 26156421 in words is "twenty-six million, one hundred fifty-six thousand, four hundred twenty-one".