26139421 has 32 divisors (see below), whose sum is σ = 36357120. Its totient is φ = 18144000.

The previous prime is 26139413. The next prime is 26139437. The reversal of 26139421 is 12493162.

It is not a de Polignac number, because 26139421 - 2³ = 26139413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26139421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26139481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24346 + ... + 25396.

It is an arithmetic number, because the mean of its divisors is an integer number (1136160).

Almost surely, 2^26139421 is an apocalyptic number.

It is an amenable number.

26139421 is a deficient number, since it is larger than the sum of its proper divisors (10217699).

26139421 is a wasteful number, since it uses less digits than its factorization.

26139421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105.

The product of its digits is 2592, while the sum is 28.

The square root of 26139421 is about 5112.6725887739. The cubic root of 26139421 is about 296.7781941209.

The spelling of 26139421 in words is "twenty-six million, one hundred thirty-nine thousand, four hundred twenty-one".