135391406 has 4 divisors (see below), whose sum is σ = 203087112. Its totient is φ = 67695702.

The previous prime is 135391381. The next prime is 135391423. The reversal of 135391406 is 604193531.

135391406 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33847850 + ... + 33847853.

It is an arithmetic number, because the mean of its divisors is an integer number (50771778).

Almost surely, 2^135391406 is an apocalyptic number.

135391406 is a deficient number, since it is larger than the sum of its proper divisors (67695706).

135391406 is an equidigital number, since it uses as much as digits as its factorization.

135391406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67695705.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 135391406 is about 11635.7812801720. The cubic root of 135391406 is about 513.4880795997.

The spelling of 135391406 in words is "one hundred thirty-five million, three hundred ninety-one thousand, four hundred six".