138440785 has 16 divisors (see below), whose sum is σ = 192268800. Its totient is φ = 93727296.

The previous prime is 138440767. The next prime is 138440789. The reversal of 138440785 is 587044831.

It is a cyclic number.

It is not a de Polignac number, because 138440785 - 2¹⁷ = 138309713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138440789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22270 + ... + 27799.

It is an arithmetic number, because the mean of its divisors is an integer number (12016800).

Almost surely, 2^138440785 is an apocalyptic number.

It is an amenable number.

138440785 is a deficient number, since it is larger than the sum of its proper divisors (53828015).

138440785 is an equidigital number, since it uses as much as digits as its factorization.

138440785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50160.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 138440785 is about 11766.0862226995. The cubic root of 138440785 is about 517.3145390956.

The spelling of 138440785 in words is "one hundred thirty-eight million, four hundred forty thousand, seven hundred eighty-five".