138213948 has 12 divisors (see below), whose sum is σ = 322499240. Its totient is φ = 46071312.

The previous prime is 138213947. The next prime is 138213967. The reversal of 138213948 is 849312831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138213941) 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, 5758903 + ... + 5758926.

Almost surely, 2^138213948 is an apocalyptic number.

It is an amenable number.

138213948 is an abundant number, since it is smaller than the sum of its proper divisors (184285292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138213948 is a wasteful number, since it uses less digits than its factorization.

138213948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11517836 (or 11517834 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 138213948 is about 11756.4428293596. The cubic root of 138213948 is about 517.0318424718.

The spelling of 138213948 in words is "one hundred thirty-eight million, two hundred thirteen thousand, nine hundred forty-eight".