138786490 has 16 divisors (see below), whose sum is σ = 252152352. Its totient is φ = 54995344.

The previous prime is 138786463. The next prime is 138786491. The reversal of 138786490 is 94687831.

It is a happy number.

138786490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 138786490.

It is not an unprimeable number, because it can be changed into a prime (138786491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63784 + ... + 65923.

It is an arithmetic number, because the mean of its divisors is an integer number (15759522).

Almost surely, 2^138786490 is an apocalyptic number.

138786490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138786490 is a deficient number, since it is larger than the sum of its proper divisors (113365862).

138786490 is a wasteful number, since it uses less digits than its factorization.

138786490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129821.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 138786490 is about 11780.7678018031. The cubic root of 138786490 is about 517.7447821726.

The spelling of 138786490 in words is "one hundred thirty-eight million, seven hundred eighty-six thousand, four hundred ninety".