26430139 has 2 divisors, whose sum is σ = 26430140. Its totient is φ = 26430138.

The previous prime is 26430133. The next prime is 26430143. The reversal of 26430139 is 93103462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26430139 - 2¹¹ = 26428091 is a prime.

It is not a weakly prime, because it can be changed into another prime (26430133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13215069 + 13215070.

It is an arithmetic number, because the mean of its divisors is an integer number (13215070).

Almost surely, 2^26430139 is an apocalyptic number.

26430139 is a deficient number, since it is larger than the sum of its proper divisors (1).

26430139 is an equidigital number, since it uses as much as digits as its factorization.

26430139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 26430139 is about 5141.0250923332. The cubic root of 26430139 is about 297.8743783837.

It can be divided in two parts, 26430 and 139, that added together give a square (26569 = 163²).

The spelling of 26430139 in words is "twenty-six million, four hundred thirty thousand, one hundred thirty-nine".