138946238 has 4 divisors (see below), whose sum is σ = 208419360. Its totient is φ = 69473118.

The previous prime is 138946237. The next prime is 138946261. The reversal of 138946238 is 832649831.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138946237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34736558 + ... + 34736561.

It is an arithmetic number, because the mean of its divisors is an integer number (52104840).

Almost surely, 2^138946238 is an apocalyptic number.

138946238 is a deficient number, since it is larger than the sum of its proper divisors (69473122).

138946238 is an equidigital number, since it uses as much as digits as its factorization.

138946238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69473121.

The product of its digits is 248832, while the sum is 44.

The square root of 138946238 is about 11787.5458853826. The cubic root of 138946238 is about 517.9433533261.

The spelling of 138946238 in words is "one hundred thirty-eight million, nine hundred forty-six thousand, two hundred thirty-eight".