138183851 has 4 divisors (see below), whose sum is σ = 148813392. Its totient is φ = 127554312.

The previous prime is 138183847. The next prime is 138183853. The reversal of 138183851 is 158381831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158381831 = 643 ⋅246317.

It is a cyclic number.

It is not a de Polignac number, because 138183851 - 2² = 138183847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138183853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5314751 + ... + 5314776.

It is an arithmetic number, because the mean of its divisors is an integer number (37203348).

Almost surely, 2^138183851 is an apocalyptic number.

138183851 is a deficient number, since it is larger than the sum of its proper divisors (10629541).

138183851 is a wasteful number, since it uses less digits than its factorization.

138183851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10629540.

The product of its digits is 23040, while the sum is 38.

The square root of 138183851 is about 11755.1627381334. The cubic root of 138183851 is about 516.9943107146.

The spelling of 138183851 in words is "one hundred thirty-eight million, one hundred eighty-three thousand, eight hundred fifty-one".