138734421 has 32 divisors (see below), whose sum is σ = 216311808. Its totient is φ = 77457600.

The previous prime is 138734389. The next prime is 138734461. The reversal of 138734421 is 124437831.

It is not a de Polignac number, because 138734421 - 2⁵ = 138734389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138734461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212131 + ... + 212783.

It is an arithmetic number, because the mean of its divisors is an integer number (6759744).

Almost surely, 2^138734421 is an apocalyptic number.

It is an amenable number.

138734421 is a deficient number, since it is larger than the sum of its proper divisors (77577387).

138734421 is a wasteful number, since it uses less digits than its factorization.

138734421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881.

The product of its digits is 16128, while the sum is 33.

The square root of 138734421 is about 11778.5576791049. The cubic root of 138734421 is about 517.6800260494.

The spelling of 138734421 in words is "one hundred thirty-eight million, seven hundred thirty-four thousand, four hundred twenty-one".