138078902 has 8 divisors (see below), whose sum is σ = 223050576. Its totient is φ = 63728712.

The previous prime is 138078877. The next prime is 138078907. The reversal of 138078902 is 209870831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138078907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2655338 + ... + 2655389.

It is an arithmetic number, because the mean of its divisors is an integer number (27881322).

Almost surely, 2^138078902 is an apocalyptic number.

138078902 is a deficient number, since it is larger than the sum of its proper divisors (84971674).

138078902 is a wasteful number, since it uses less digits than its factorization.

138078902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5310742.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 138078902 is about 11750.6979367185. The cubic root of 138078902 is about 516.8633938783.

The spelling of 138078902 in words is "one hundred thirty-eight million, seventy-eight thousand, nine hundred two".