138009357 has 6 divisors (see below), whose sum is σ = 199346862. Its totient is φ = 92006232.

The previous prime is 138009353. The next prime is 138009359. The reversal of 138009357 is 753900831.

138009357 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 124679556 + 13329801 = 11166^2 + 3651^2 .

It is not a de Polignac number, because 138009357 - 2² = 138009353 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138009353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7667178 + ... + 7667195.

It is an arithmetic number, because the mean of its divisors is an integer number (33224477).

Almost surely, 2^138009357 is an apocalyptic number.

It is an amenable number.

138009357 is a deficient number, since it is larger than the sum of its proper divisors (61337505).

138009357 is a wasteful number, since it uses less digits than its factorization.

138009357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15334379 (or 15334376 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 138009357 is about 11747.7383780879. The cubic root of 138009357 is about 516.7766046086.

The spelling of 138009357 in words is "one hundred thirty-eight million, nine thousand, three hundred fifty-seven".