26139940 has 12 divisors (see below), whose sum is σ = 54893916. Its totient is φ = 10455968.

The previous prime is 26139899. The next prime is 26139941. The reversal of 26139940 is 4993162.

It can be written as a sum of positive squares in 2 ways, for example, as 9834496 + 16305444 = 3136^2 + 4038^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26139896 and 26139905.

It is not an unprimeable number, because it can be changed into a prime (26139941) 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, 653479 + ... + 653518.

It is an arithmetic number, because the mean of its divisors is an integer number (4574493).

Almost surely, 2^26139940 is an apocalyptic number.

26139940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26139940 is an abundant number, since it is smaller than the sum of its proper divisors (28753976).

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

26139940 is a wasteful number, since it uses less digits than its factorization.

26139940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307006 (or 1307004 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 26139940 is about 5112.7233447547. The cubic root of 26139940 is about 296.7801582917.

The spelling of 26139940 in words is "twenty-six million, one hundred thirty-nine thousand, nine hundred forty".