138780914 has 4 divisors (see below), whose sum is σ = 208171374. Its totient is φ = 69390456.

The previous prime is 138780913. The next prime is 138780937. The reversal of 138780914 is 419087831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 419087831 = 199 ⋅2105969.

It can be written as a sum of positive squares in only one way, i.e., 136773025 + 2007889 = 11695^2 + 1417^2 .

It is not an unprimeable number, because it can be changed into a prime (138780913) by changing a digit.

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, 34695227 + ... + 34695230.

Almost surely, 2^138780914 is an apocalyptic number.

138780914 is a deficient number, since it is larger than the sum of its proper divisors (69390460).

138780914 is an equidigital number, since it uses as much as digits as its factorization.

138780914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69390459.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 138780914 is about 11780.5311425249. The cubic root of 138780914 is about 517.7378482999.

The spelling of 138780914 in words is "one hundred thirty-eight million, seven hundred eighty thousand, nine hundred fourteen".