139838393 has 2 divisors, whose sum is σ = 139838394. Its totient is φ = 139838392.

The previous prime is 139838383. The next prime is 139838441. The reversal of 139838393 is 393838931.

139838393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138485824 + 1352569 = 11768^2 + 1163^2 .

It is a cyclic number.

It is not a de Polignac number, because 139838393 - 2⁶ = 139838329 is a prime.

It is not a weakly prime, because it can be changed into another prime (139838323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69919196 + 69919197.

It is an arithmetic number, because the mean of its divisors is an integer number (69919197).

Almost surely, 2^139838393 is an apocalyptic number.

It is an amenable number.

139838393 is a deficient number, since it is larger than the sum of its proper divisors (1).

139838393 is an equidigital number, since it uses as much as digits as its factorization.

139838393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 139838393 is about 11825.3284520981. The cubic root of 139838393 is about 519.0495372123.

The spelling of 139838393 in words is "one hundred thirty-nine million, eight hundred thirty-eight thousand, three hundred ninety-three".