138412730 has 8 divisors (see below), whose sum is σ = 249142932. Its totient is φ = 55365088.

The previous prime is 138412717. The next prime is 138412763. The reversal of 138412730 is 37214831.

It can be written as a sum of positive squares in 2 ways, for example, as 135233641 + 3179089 = 11629^2 + 1783^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 138412693 and 138412702.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6920627 + ... + 6920646.

Almost surely, 2^138412730 is an apocalyptic number.

138412730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138412730 is a deficient number, since it is larger than the sum of its proper divisors (110730202).

138412730 is a wasteful number, since it uses less digits than its factorization.

138412730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13841280.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 138412730 is about 11764.8939646730. The cubic root of 138412730 is about 517.2795921689.

The spelling of 138412730 in words is "one hundred thirty-eight million, four hundred twelve thousand, seven hundred thirty".