26405139 has 16 divisors (see below), whose sum is σ = 36381312. Its totient is φ = 17024448.

The previous prime is 26405129. The next prime is 26405147. The reversal of 26405139 is 93150462.

It is not a de Polignac number, because 26405139 - 2⁴ = 26405123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26405129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12847 + ... + 14759.

It is an arithmetic number, because the mean of its divisors is an integer number (2273832).

Almost surely, 2^26405139 is an apocalyptic number.

26405139 is a deficient number, since it is larger than the sum of its proper divisors (9976173).

26405139 is a wasteful number, since it uses less digits than its factorization.

26405139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 26405139 is about 5138.5930953910. The cubic root of 26405139 is about 297.7804299730.

The spelling of 26405139 in words is "twenty-six million, four hundred five thousand, one hundred thirty-nine".