138683949 has 4 divisors (see below), whose sum is σ = 184911936. Its totient is φ = 92455964.

The previous prime is 138683939. The next prime is 138683957. The reversal of 138683949 is 949386831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138683949 - 2⁴ = 138683933 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138683929) 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, 23113989 + ... + 23113994.

It is an arithmetic number, because the mean of its divisors is an integer number (46227984).

Almost surely, 2^138683949 is an apocalyptic number.

It is an amenable number.

138683949 is a deficient number, since it is larger than the sum of its proper divisors (46227987).

138683949 is an equidigital number, since it uses as much as digits as its factorization.

138683949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46227986.

The product of its digits is 1119744, while the sum is 51.

The square root of 138683949 is about 11776.4149468334. The cubic root of 138683949 is about 517.6172405843.

The spelling of 138683949 in words is "one hundred thirty-eight million, six hundred eighty-three thousand, nine hundred forty-nine".