136905442 has 8 divisors (see below), whose sum is σ = 206157996. Its totient is φ = 68186112.

The previous prime is 136905427. The next prime is 136905443. The reversal of 136905442 is 244509631.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 127486681 + 9418761 = 11291^2 + 3069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 136905398 and 136905407.

It is not an unprimeable number, because it can be changed into a prime (136905443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132663 + ... + 133690.

Almost surely, 2^136905442 is an apocalyptic number.

136905442 is a deficient number, since it is larger than the sum of its proper divisors (69252554).

136905442 is a wasteful number, since it uses less digits than its factorization.

136905442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266612.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 136905442 is about 11700.6598959204. The cubic root of 136905442 is about 515.3950429852.

The spelling of 136905442 in words is "one hundred thirty-six million, nine hundred five thousand, four hundred forty-two".