138449786 has 16 divisors (see below), whose sum is σ = 209796480. Its totient is φ = 68521200.

The previous prime is 138449783. The next prime is 138449807. The reversal of 138449786 is 687944831.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138449783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107780 + ... + 109056.

It is an arithmetic number, because the mean of its divisors is an integer number (13112280).

Almost surely, 2^138449786 is an apocalyptic number.

138449786 is a deficient number, since it is larger than the sum of its proper divisors (71346694).

138449786 is a wasteful number, since it uses less digits than its factorization.

138449786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789.

The product of its digits is 1161216, while the sum is 50.

The square root of 138449786 is about 11766.4687141045. The cubic root of 138449786 is about 517.3257502601.

The spelling of 138449786 in words is "one hundred thirty-eight million, four hundred forty-nine thousand, seven hundred eighty-six".