138897693 has 16 divisors (see below), whose sum is σ = 224481600. Its totient is φ = 84180240.

The previous prime is 138897691. The next prime is 138897749. The reversal of 138897693 is 396798831.

It is not a de Polignac number, because 138897693 - 2¹ = 138897691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138897691) 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 15 ways as a sum of consecutive naturals, for example, 233538 + ... + 234131.

It is an arithmetic number, because the mean of its divisors is an integer number (14030100).

Almost surely, 2^138897693 is an apocalyptic number.

It is an amenable number.

138897693 is a deficient number, since it is larger than the sum of its proper divisors (85583907).

138897693 is a wasteful number, since it uses less digits than its factorization.

138897693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467689 (or 467683 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 138897693 is about 11785.4865406567. The cubic root of 138897693 is about 517.8830266625.

The spelling of 138897693 in words is "one hundred thirty-eight million, eight hundred ninety-seven thousand, six hundred ninety-three".