138889962 has 48 divisors (see below), whose sum is σ = 330557760. Its totient is φ = 41950656.

The previous prime is 138889937. The next prime is 138889963. The reversal of 138889962 is 269988831.

It is a happy number.

It is a super-2 number, since 2×138889962² = 38580843088722888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138889899 and 138889908.

It is not an unprimeable number, because it can be changed into a prime (138889963) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 963 + ... + 16694.

It is an arithmetic number, because the mean of its divisors is an integer number (6886620).

Almost surely, 2^138889962 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138889962, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165278880).

138889962 is an abundant number, since it is smaller than the sum of its proper divisors (191667798).

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

138889962 is a wasteful number, since it uses less digits than its factorization.

138889962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17707 (or 17704 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 138889962 is about 11785.1585479365. The cubic root of 138889962 is about 517.8734180845.

The spelling of 138889962 in words is "one hundred thirty-eight million, eight hundred eighty-nine thousand, nine hundred sixty-two".