138443862 has 16 divisors (see below), whose sum is σ = 284371632. Its totient is φ = 44900640.

The previous prime is 138443807. The next prime is 138443863. The reversal of 138443862 is 268344831.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 138443862.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138443863) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 311589 + ... + 312032.

It is an arithmetic number, because the mean of its divisors is an integer number (17773227).

Almost surely, 2^138443862 is an apocalyptic number.

138443862 is an abundant number, since it is smaller than the sum of its proper divisors (145927770).

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

138443862 is a wasteful number, since it uses less digits than its factorization.

138443862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623663.

The product of its digits is 110592, while the sum is 39.

The square root of 138443862 is about 11766.2169791314. The cubic root of 138443862 is about 517.3183716970.

The spelling of 138443862 in words is "one hundred thirty-eight million, four hundred forty-three thousand, eight hundred sixty-two".