138760381 has 2 divisors, whose sum is σ = 138760382. Its totient is φ = 138760380.

The previous prime is 138760373. The next prime is 138760387. The reversal of 138760381 is 183067831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101183481 + 37576900 = 10059^2 + 6130^2 .

It is a cyclic number.

It is not a de Polignac number, because 138760381 - 2³ = 138760373 is a prime.

It is a super-2 number, since 2×138760381² = 38508886670530322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138760381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138760387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69380190 + 69380191.

It is an arithmetic number, because the mean of its divisors is an integer number (69380191).

Almost surely, 2^138760381 is an apocalyptic number.

It is an amenable number.

138760381 is a deficient number, since it is larger than the sum of its proper divisors (1).

138760381 is an equidigital number, since it uses as much as digits as its factorization.

138760381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 138760381 is about 11779.6596300572. The cubic root of 138760381 is about 517.7123134833.

It can be divided in two parts, 1387603 and 81, that added together give a square (1387684 = 1178²).

The spelling of 138760381 in words is "one hundred thirty-eight million, seven hundred sixty thousand, three hundred eighty-one".