138399629 has 8 divisors (see below), whose sum is σ = 150708000. Its totient is φ = 126593712.

The previous prime is 138399619. The next prime is 138399649. The reversal of 138399629 is 926993831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138399629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138399619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125039 + ... + 126140.

It is an arithmetic number, because the mean of its divisors is an integer number (18838500).

Almost surely, 2^138399629 is an apocalyptic number.

138399629 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

138399629 is a deficient number, since it is larger than the sum of its proper divisors (12308371).

138399629 is a wasteful number, since it uses less digits than its factorization.

138399629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251227.

The product of its digits is 629856, while the sum is 50.

The square root of 138399629 is about 11764.3371678986. The cubic root of 138399629 is about 517.2632711900.

The spelling of 138399629 in words is "one hundred thirty-eight million, three hundred ninety-nine thousand, six hundred twenty-nine".