138995949 has 4 divisors (see below), whose sum is σ = 185327936. Its totient is φ = 92663964.

The previous prime is 138995933. The next prime is 138995999. The reversal of 138995949 is 949599831.

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 not a de Polignac number, because 138995949 - 2⁴ = 138995933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138995929) 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 3 ways as a sum of consecutive naturals, for example, 23165989 + ... + 23165994.

It is an arithmetic number, because the mean of its divisors is an integer number (46331984).

Almost surely, 2^138995949 is an apocalyptic number.

It is an amenable number.

138995949 is a deficient number, since it is larger than the sum of its proper divisors (46331987).

138995949 is an equidigital number, since it uses as much as digits as its factorization.

138995949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46331986.

The product of its digits is 3149280, while the sum is 57.

The square root of 138995949 is about 11789.6543206321. The cubic root of 138995949 is about 518.0051144131.

The spelling of 138995949 in words is "one hundred thirty-eight million, nine hundred ninety-five thousand, nine hundred forty-nine".