138443030 has 32 divisors (see below), whose sum is σ = 272788128. Its totient is φ = 50169600.

The previous prime is 138443029. The next prime is 138443033. The reversal of 138443030 is 30344831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138443033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32420 + ... + 36440.

It is an arithmetic number, because the mean of its divisors is an integer number (8524629).

Almost surely, 2^138443030 is an apocalyptic number.

138443030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138443030 is a deficient number, since it is larger than the sum of its proper divisors (134345098).

138443030 is a wasteful number, since it uses less digits than its factorization.

138443030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4352.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 138443030 is about 11766.1816236194. The cubic root of 138443030 is about 517.3173353931.

Adding to 138443030 its reverse (30344831), we get a palindrome (168787861).

The spelling of 138443030 in words is "one hundred thirty-eight million, four hundred forty-three thousand, thirty".