138780345 has 24 divisors (see below), whose sum is σ = 244073088. Its totient is φ = 67286560.

The previous prime is 138780337. The next prime is 138780347. The reversal of 138780345 is 543087831.

138780345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138780345 - 2³ = 138780337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138780347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36417 + ... + 40046.

It is an arithmetic number, because the mean of its divisors is an integer number (10169712).

Almost surely, 2^138780345 is an apocalyptic number.

138780345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138780345 is a deficient number, since it is larger than the sum of its proper divisors (105292743).

138780345 is a wasteful number, since it uses less digits than its factorization.

138780345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76493 (or 76482 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 138780345 is about 11780.5069924855. The cubic root of 138780345 is about 517.7371407261.

The spelling of 138780345 in words is "one hundred thirty-eight million, seven hundred eighty thousand, three hundred forty-five".