138673997 has 8 divisors (see below), whose sum is σ = 172892352. Its totient is φ = 108057600.

The previous prime is 138673979. The next prime is 138674009. The reversal of 138673997 is 799376831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138673997 - 2¹⁰ = 138672973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138673697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 900404 + ... + 900557.

It is an arithmetic number, because the mean of its divisors is an integer number (21611544).

Almost surely, 2^138673997 is an apocalyptic number.

It is an amenable number.

138673997 is a deficient number, since it is larger than the sum of its proper divisors (34218355).

138673997 is a wasteful number, since it uses less digits than its factorization.

138673997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800979.

The product of its digits is 1714608, while the sum is 53.

The square root of 138673997 is about 11775.9923997937. The cubic root of 138673997 is about 517.6048588342.

The spelling of 138673997 in words is "one hundred thirty-eight million, six hundred seventy-three thousand, nine hundred ninety-seven".