26409140 has 24 divisors (see below), whose sum is σ = 57372840. Its totient is φ = 10199168.

The previous prime is 26409139. The next prime is 26409161. The reversal of 26409140 is 4190462.

It can be written as a sum of positive squares in 4 ways, for example, as 2808976 + 23600164 = 1676^2 + 4858^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 22187 + ... + 23346.

It is an arithmetic number, because the mean of its divisors is an integer number (2390535).

Almost surely, 2^26409140 is an apocalyptic number.

26409140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26409140 is an abundant number, since it is smaller than the sum of its proper divisors (30963700).

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

26409140 is a wasteful number, since it uses less digits than its factorization.

26409140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45571 (or 45569 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 26409140 is about 5138.9823895398. The cubic root of 26409140 is about 297.7954694612.

The spelling of 26409140 in words is "twenty-six million, four hundred nine thousand, one hundred forty".