138212130 has 32 divisors (see below), whose sum is σ = 379096704. Its totient is φ = 31591296.

The previous prime is 138212119. The next prime is 138212147. The reversal of 138212130 is 31212831.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 138212097 and 138212106.

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 in 15 ways as a sum of consecutive naturals, for example, 328867 + ... + 329286.

It is an arithmetic number, because the mean of its divisors is an integer number (11846772).

Almost surely, 2^138212130 is an apocalyptic number.

138212130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138212130 is an abundant number, since it is smaller than the sum of its proper divisors (240884574).

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

138212130 is a wasteful number, since it uses less digits than its factorization.

138212130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658170.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 138212130 is about 11756.3655097994. The cubic root of 138212130 is about 517.0295755322.

Adding to 138212130 its reverse (31212831), we get a palindrome (169424961).

It can be divided in two parts, 13821 and 2130, that added together give a palindrome (15951).

The spelling of 138212130 in words is "one hundred thirty-eight million, two hundred twelve thousand, one hundred thirty".