26402165 has 4 divisors (see below), whose sum is σ = 31682604. Its totient is φ = 21121728.

The previous prime is 26402161. The next prime is 26402179. The reversal of 26402165 is 56120462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56120462 = 2 ⋅28060231.

It can be written as a sum of positive squares in 2 ways, for example, as 7540516 + 18861649 = 2746^2 + 4343^2 .

It is a cyclic number.

It is not a de Polignac number, because 26402165 - 2² = 26402161 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 (26402161) 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, 2640212 + ... + 2640221.

It is an arithmetic number, because the mean of its divisors is an integer number (7920651).

Almost surely, 2^26402165 is an apocalyptic number.

It is an amenable number.

26402165 is a deficient number, since it is larger than the sum of its proper divisors (5280439).

26402165 is an equidigital number, since it uses as much as digits as its factorization.

26402165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5280438.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 26402165 is about 5138.3037084236. The cubic root of 26402165 is about 297.7692499239.

It can be divided in two parts, 2 and 6402165, that multiplied together give a triangular number (12804330 = T₅₀₆₀).

The spelling of 26402165 in words is "twenty-six million, four hundred two thousand, one hundred sixty-five".