138909429 has 12 divisors (see below), whose sum is σ = 201489600. Its totient is φ = 92217384.

The previous prime is 138909427. The next prime is 138909439. The reversal of 138909429 is 924909831.

138909429 is a `hidden beast` number, since 138 + 90 + 9 + 429 = 666.

It is not a de Polignac number, because 138909429 - 2¹ = 138909427 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138909427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30139 + ... + 34440.

It is an arithmetic number, because the mean of its divisors is an integer number (16790800).

Almost surely, 2^138909429 is an apocalyptic number.

It is an amenable number.

138909429 is a deficient number, since it is larger than the sum of its proper divisors (62580171).

138909429 is a wasteful number, since it uses less digits than its factorization.

138909429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64824 (or 64821 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 138909429 is about 11785.9844306702. The cubic root of 138909429 is about 517.8976122276.

The spelling of 138909429 in words is "one hundred thirty-eight million, nine hundred nine thousand, four hundred twenty-nine".