138719942 has 16 divisors (see below), whose sum is σ = 211444992. Its totient is φ = 68242440.

The previous prime is 138719909. The next prime is 138719957. The reversal of 138719942 is 249917831.

It is a junction number, because it is equal to n+sod(n) for n = 138719893 and 138719902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116273 + ... + 117459.

It is an arithmetic number, because the mean of its divisors is an integer number (13215312).

Almost surely, 2^138719942 is an apocalyptic number.

138719942 is a deficient number, since it is larger than the sum of its proper divisors (72725050).

138719942 is a wasteful number, since it uses less digits than its factorization.

138719942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083.

The product of its digits is 108864, while the sum is 44.

The square root of 138719942 is about 11777.9430292390. The cubic root of 138719942 is about 517.6620162198.

The spelling of 138719942 in words is "one hundred thirty-eight million, seven hundred nineteen thousand, nine hundred forty-two".