138211235 has 4 divisors (see below), whose sum is σ = 165853488. Its totient is φ = 110568984.

The previous prime is 138211201. The next prime is 138211253. The reversal of 138211235 is 532112831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138211235 - 2²² = 134016931 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13821119 + ... + 13821128.

It is an arithmetic number, because the mean of its divisors is an integer number (41463372).

Almost surely, 2^138211235 is an apocalyptic number.

138211235 is a deficient number, since it is larger than the sum of its proper divisors (27642253).

138211235 is an equidigital number, since it uses as much as digits as its factorization.

138211235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27642252.

The product of its digits is 1440, while the sum is 26.

The square root of 138211235 is about 11756.3274452526. The cubic root of 138211235 is about 517.0284595123.

It can be divided in two parts, 138 and 211235, that multiplied together give a triangular number (29150430 = T₇₆₃₅).

The spelling of 138211235 in words is "one hundred thirty-eight million, two hundred eleven thousand, two hundred thirty-five".