138403368 has 24 divisors (see below), whose sum is σ = 374842650. Its totient is φ = 46134432.

The previous prime is 138403367. The next prime is 138403373. The reversal of 138403368 is 863304831.

It is a happy number.

138403368 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 90212004 + 48191364 = 9498^2 + 6942^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (138403361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 961063 + ... + 961206.

Almost surely, 2^138403368 is an apocalyptic number.

138403368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138403368 is an abundant number, since it is smaller than the sum of its proper divisors (236439282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138403368 is a wasteful number, since it uses less digits than its factorization.

138403368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922281 (or 1922274 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 138403368 is about 11764.4960793057. The cubic root of 138403368 is about 517.2679292707.

The spelling of 138403368 in words is "one hundred thirty-eight million, four hundred three thousand, three hundred sixty-eight".