138781339 has 16 divisors (see below), whose sum is σ = 153556480. Its totient is φ = 124921440.

The previous prime is 138781337. The next prime is 138781343. The reversal of 138781339 is 933187831.

It is a cyclic number.

It is not a de Polignac number, because 138781339 - 2¹ = 138781337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 138781295 and 138781304.

It is not an unprimeable number, because it can be changed into a prime (138781337) 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, 27934 + ... + 32524.

It is an arithmetic number, because the mean of its divisors is an integer number (9597280).

Almost surely, 2^138781339 is an apocalyptic number.

138781339 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138781339 is a deficient number, since it is larger than the sum of its proper divisors (14775141).

138781339 is a wasteful number, since it uses less digits than its factorization.

138781339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4690.

The product of its digits is 108864, while the sum is 43.

The square root of 138781339 is about 11780.5491807471. The cubic root of 138781339 is about 517.7383768028.

The spelling of 138781339 in words is "one hundred thirty-eight million, seven hundred eighty-one thousand, three hundred thirty-nine".