138742212 has 24 divisors (see below), whose sum is σ = 369979456. Its totient is φ = 39640608.

The previous prime is 138742183. The next prime is 138742223. The reversal of 138742212 is 212247831.

It is a self number, because there is not a number n which added to its sum of digits gives 138742212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 825763 + ... + 825930.

Almost surely, 2^138742212 is an apocalyptic number.

138742212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138742212 is an abundant number, since it is smaller than the sum of its proper divisors (231237244).

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

138742212 is a wasteful number, since it uses less digits than its factorization.

138742212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651707 (or 1651705 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 138742212 is about 11778.8884025616. Note that the first 3 decimals coincide. The cubic root of 138742212 is about 517.6897164338.

The spelling of 138742212 in words is "one hundred thirty-eight million, seven hundred forty-two thousand, two hundred twelve".