138917394 has 96 divisors (see below), whose sum is σ = 380674944. Its totient is φ = 35562240.

The previous prime is 138917381. The next prime is 138917411. The reversal of 138917394 is 493719831.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100492 + ... + 101864.

It is an arithmetic number, because the mean of its divisors is an integer number (3965364).

Almost surely, 2^138917394 is an apocalyptic number.

138917394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138917394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190337472).

138917394 is an abundant number, since it is smaller than the sum of its proper divisors (241757550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138917394 is a wasteful number, since it uses less digits than its factorization.

138917394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472 (or 1469 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 138917394 is about 11786.3223271723. The cubic root of 138917394 is about 517.9075107053.

The spelling of 138917394 in words is "one hundred thirty-eight million, nine hundred seventeen thousand, three hundred ninety-four".