138802393 has 2 divisors, whose sum is σ = 138802394. Its totient is φ = 138802392.

The previous prime is 138802387. The next prime is 138802423. The reversal of 138802393 is 393208831.

138802393 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., 95413824 + 43388569 = 9768^2 + 6587^2 .

It is an emirp because it is prime and its reverse (393208831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138802393 - 2⁵ = 138802361 is a prime.

It is a super-2 number, since 2×138802393² = 38532208605052898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138802303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69401196 + 69401197.

It is an arithmetic number, because the mean of its divisors is an integer number (69401197).

Almost surely, 2^138802393 is an apocalyptic number.

It is an amenable number.

138802393 is a deficient number, since it is larger than the sum of its proper divisors (1).

138802393 is an equidigital number, since it uses as much as digits as its factorization.

138802393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 138802393 is about 11781.4427384765. The cubic root of 138802393 is about 517.7645568659.

The spelling of 138802393 in words is "one hundred thirty-eight million, eight hundred two thousand, three hundred ninety-three".