138961142 has 4 divisors (see below), whose sum is σ = 208441716. Its totient is φ = 69480570.

The previous prime is 138961139. The next prime is 138961181. The reversal of 138961142 is 241169831.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34740284 + ... + 34740287.

It is an arithmetic number, because the mean of its divisors is an integer number (52110429).

Almost surely, 2^138961142 is an apocalyptic number.

138961142 is a deficient number, since it is larger than the sum of its proper divisors (69480574).

138961142 is an equidigital number, since it uses as much as digits as its factorization.

138961142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69480573.

The product of its digits is 10368, while the sum is 35.

The square root of 138961142 is about 11788.1780610915. The cubic root of 138961142 is about 517.9618716439.

The spelling of 138961142 in words is "one hundred thirty-eight million, nine hundred sixty-one thousand, one hundred forty-two".