138020442 has 32 divisors (see below), whose sum is σ = 315850752. Its totient is φ = 39387504.

The previous prime is 138020437. The next prime is 138020479. The reversal of 138020442 is 244020831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50023 + ... + 52709.

It is an arithmetic number, because the mean of its divisors is an integer number (9870336).

Almost surely, 2^138020442 is an apocalyptic number.

138020442 is an abundant number, since it is smaller than the sum of its proper divisors (177830310).

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

138020442 is a wasteful number, since it uses less digits than its factorization.

138020442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 138020442 is about 11748.2101615523. The cubic root of 138020442 is about 516.7904401809.

The spelling of 138020442 in words is "one hundred thirty-eight million, twenty thousand, four hundred forty-two".