138224942 has 4 divisors (see below), whose sum is σ = 207337416. Its totient is φ = 69112470.

The previous prime is 138224929. The next prime is 138224951. The reversal of 138224942 is 249422831.

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

It is a super-2 number, since 2×138224942² = 38212269181806728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 34556234 + ... + 34556237.

It is an arithmetic number, because the mean of its divisors is an integer number (51834354).

Almost surely, 2^138224942 is an apocalyptic number.

138224942 is a deficient number, since it is larger than the sum of its proper divisors (69112474).

138224942 is an equidigital number, since it uses as much as digits as its factorization.

138224942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69112473.

The product of its digits is 27648, while the sum is 35.

The square root of 138224942 is about 11756.9103934665. The cubic root of 138224942 is about 517.0455509227.

The spelling of 138224942 in words is "one hundred thirty-eight million, two hundred twenty-four thousand, nine hundred forty-two".