138743964 has 36 divisors (see below), whose sum is σ = 351158080. Its totient is φ = 46189440.

The previous prime is 138743963. The next prime is 138743971. The reversal of 138743964 is 469347831.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138743963) 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, 33732 + ... + 37620.

Almost surely, 2^138743964 is an apocalyptic number.

It is an amenable number.

138743964 is an abundant number, since it is smaller than the sum of its proper divisors (212414116).

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

138743964 is a wasteful number, since it uses less digits than its factorization.

138743964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4890 (or 4885 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 138743964 is about 11778.9627726723. The cubic root of 138743964 is about 517.6918955076.

The spelling of 138743964 in words is "one hundred thirty-eight million, seven hundred forty-three thousand, nine hundred sixty-four".