138405302 has 16 divisors (see below), whose sum is σ = 242109600. Its totient is φ = 59316264.

The previous prime is 138405301. The next prime is 138405307. The reversal of 138405302 is 203504831.

138405302 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138405302² = 38312055243422408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138405301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100193 + ... + 101564.

It is an arithmetic number, because the mean of its divisors is an integer number (15131850).

Almost surely, 2^138405302 is an apocalyptic number.

138405302 is a deficient number, since it is larger than the sum of its proper divisors (103704298).

138405302 is an equidigital number, since it uses as much as digits as its factorization.

138405302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201780 (or 201766 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 138405302 is about 11764.5782754844. The cubic root of 138405302 is about 517.2703386329.

The spelling of 138405302 in words is "one hundred thirty-eight million, four hundred five thousand, three hundred two".