138987146 has 4 divisors (see below), whose sum is σ = 208480722. Its totient is φ = 69493572.

The previous prime is 138987143. The next prime is 138987151. The reversal of 138987146 is 641789831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 641789831 = 17 ⋅37752343.

It can be written as a sum of positive squares in only one way, i.e., 106894921 + 32092225 = 10339^2 + 5665^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138987146.

It is not an unprimeable number, because it can be changed into a prime (138987143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34746785 + ... + 34746788.

Almost surely, 2^138987146 is an apocalyptic number.

138987146 is a deficient number, since it is larger than the sum of its proper divisors (69493576).

138987146 is an equidigital number, since it uses as much as digits as its factorization.

138987146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69493575.

The product of its digits is 290304, while the sum is 47.

The square root of 138987146 is about 11789.2809789232. The cubic root of 138987146 is about 517.9941786141.

The spelling of 138987146 in words is "one hundred thirty-eight million, nine hundred eighty-seven thousand, one hundred forty-six".