138970388 has 6 divisors (see below), whose sum is σ = 243198186. Its totient is φ = 69485192.

The previous prime is 138970387. The next prime is 138970421. The reversal of 138970388 is 883079831.

It can be written as a sum of positive squares in only one way, i.e., 103591684 + 35378704 = 10178^2 + 5948^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138970387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17371295 + ... + 17371302.

It is an arithmetic number, because the mean of its divisors is an integer number (40533031).

Almost surely, 2^138970388 is an apocalyptic number.

It is an amenable number.

138970388 is a deficient number, since it is larger than the sum of its proper divisors (104227798).

138970388 is a wasteful number, since it uses less digits than its factorization.

138970388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34742601 (or 34742599 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 138970388 is about 11788.5702271310. The cubic root of 138970388 is about 517.9733591940.

The spelling of 138970388 in words is "one hundred thirty-eight million, nine hundred seventy thousand, three hundred eighty-eight".