138510146 has 4 divisors (see below), whose sum is σ = 207765222. Its totient is φ = 69255072.

The previous prime is 138510143. The next prime is 138510161. The reversal of 138510146 is 641015831.

138510146 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 641015831 = 2617 ⋅244943.

It can be written as a sum of positive squares in only one way, i.e., 131354521 + 7155625 = 11461^2 + 2675^2 .

It is not an unprimeable number, because it can be changed into a prime (138510143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34627535 + ... + 34627538.

Almost surely, 2^138510146 is an apocalyptic number.

138510146 is a deficient number, since it is larger than the sum of its proper divisors (69255076).

138510146 is an equidigital number, since it uses as much as digits as its factorization.

138510146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69255075.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 138510146 is about 11769.0333502799. The cubic root of 138510146 is about 517.4009188981.

Adding to 138510146 its reverse (641015831), we get a palindrome (779525977).

The spelling of 138510146 in words is "one hundred thirty-eight million, five hundred ten thousand, one hundred forty-six".