138429993 has 16 divisors (see below), whose sum is σ = 203003136. Its totient is φ = 83374080.

The previous prime is 138429983. The next prime is 138430001. The reversal of 138429993 is 399924831.

It is not a de Polignac number, because 138429993 - 2⁸ = 138429737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138429983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35928 + ... + 39593.

It is an arithmetic number, because the mean of its divisors is an integer number (12687696).

Almost surely, 2^138429993 is an apocalyptic number.

138429993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138429993 is a deficient number, since it is larger than the sum of its proper divisors (64573143).

138429993 is a wasteful number, since it uses less digits than its factorization.

138429993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75584.

The product of its digits is 419904, while the sum is 48.

The square root of 138429993 is about 11765.6276075694. The cubic root of 138429993 is about 517.3010965165.

The spelling of 138429993 in words is "one hundred thirty-eight million, four hundred twenty-nine thousand, nine hundred ninety-three".