138918345 has 16 divisors (see below), whose sum is σ = 224949312. Its totient is φ = 73196480.

The previous prime is 138918341. The next prime is 138918359. The reversal of 138918345 is 543819831.

138918345 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 138918345 - 2² = 138918341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138918297 and 138918306.

It is not an unprimeable number, because it can be changed into a prime (138918341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54546 + ... + 57035.

It is an arithmetic number, because the mean of its divisors is an integer number (14059332).

Almost surely, 2^138918345 is an apocalyptic number.

138918345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138918345 is a deficient number, since it is larger than the sum of its proper divisors (86030967).

138918345 is a wasteful number, since it uses less digits than its factorization.

138918345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111672.

The product of its digits is 103680, while the sum is 42.

The square root of 138918345 is about 11786.3626704764. The cubic root of 138918345 is about 517.9086925321.

The spelling of 138918345 in words is "one hundred thirty-eight million, nine hundred eighteen thousand, three hundred forty-five".