26909840 has 20 divisors (see below), whose sum is σ = 62565564. Its totient is φ = 10763904.

The previous prime is 26909801. The next prime is 26909863. The reversal of 26909840 is 4890962.

It can be written as a sum of positive squares in 2 ways, for example, as 16386304 + 10523536 = 4048^2 + 3244^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×26909840³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 26909794 and 26909803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168107 + ... + 168266.

Almost surely, 2^26909840 is an apocalyptic number.

26909840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26909840 is an abundant number, since it is smaller than the sum of its proper divisors (35655724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26909840 is a wasteful number, since it uses less digits than its factorization.

26909840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336386 (or 336380 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 26909840 is about 5187.4695179827. The cubic root of 26909840 is about 299.6657016946.

The spelling of 26909840 in words is "twenty-six million, nine hundred nine thousand, eight hundred forty".