138851998 has 8 divisors (see below), whose sum is σ = 208362960. Its totient is φ = 69397680.

The previous prime is 138851963. The next prime is 138852017. The reversal of 138851998 is 899158831.

138851998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7383 + ... + 18226.

It is an arithmetic number, because the mean of its divisors is an integer number (26045370).

Almost surely, 2^138851998 is an apocalyptic number.

138851998 is a deficient number, since it is larger than the sum of its proper divisors (69510962).

138851998 is a wasteful number, since it uses less digits than its factorization.

138851998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28322.

The product of its digits is 622080, while the sum is 52.

The square root of 138851998 is about 11783.5477679687. The cubic root of 138851998 is about 517.8262288378.

The spelling of 138851998 in words is "one hundred thirty-eight million, eight hundred fifty-one thousand, nine hundred ninety-eight".