138169785 has 16 divisors (see below), whose sum is σ = 238077504. Its totient is φ = 68021952.

The previous prime is 138169747. The next prime is 138169831. The reversal of 138169785 is 587961831.

138169785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138169785 - 2¹⁴ = 138153401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354087 + ... + 354476.

It is an arithmetic number, because the mean of its divisors is an integer number (14879844).

Almost surely, 2^138169785 is an apocalyptic number.

138169785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138169785 is a deficient number, since it is larger than the sum of its proper divisors (99907719).

138169785 is a wasteful number, since it uses less digits than its factorization.

138169785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708584.

The product of its digits is 362880, while the sum is 48.

The square root of 138169785 is about 11754.5644325938. The cubic root of 138169785 is about 516.9767681709.

The spelling of 138169785 in words is "one hundred thirty-eight million, one hundred sixty-nine thousand, seven hundred eighty-five".