138850042 has 4 divisors (see below), whose sum is σ = 208275066. Its totient is φ = 69425020.

The previous prime is 138850037. The next prime is 138850051. The reversal of 138850042 is 240058831.

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

It can be written as a sum of positive squares in only one way, i.e., 138791961 + 58081 = 11781^2 + 241^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 138849986 and 138850013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34712509 + ... + 34712512.

Almost surely, 2^138850042 is an apocalyptic number.

138850042 is a deficient number, since it is larger than the sum of its proper divisors (69425024).

138850042 is an equidigital number, since it uses as much as digits as its factorization.

138850042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69425023.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 138850042 is about 11783.4647706012. The cubic root of 138850042 is about 517.8237972971.

The spelling of 138850042 in words is "one hundred thirty-eight million, eight hundred fifty thousand, forty-two".