138042130 has 8 divisors (see below), whose sum is σ = 248475852. Its totient is φ = 55216848.

The previous prime is 138042127. The next prime is 138042131. The reversal of 138042130 is 31240831.

It can be written as a sum of positive squares in 2 ways, for example, as 125910841 + 12131289 = 11221^2 + 3483^2 .

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

It is not an unprimeable number, because it can be changed into a prime (138042131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6902097 + ... + 6902116.

Almost surely, 2^138042130 is an apocalyptic number.

138042130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138042130 is a deficient number, since it is larger than the sum of its proper divisors (110433722).

138042130 is a wasteful number, since it uses less digits than its factorization.

138042130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13804220.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 138042130 is about 11749.1331595144. The cubic root of 138042130 is about 516.8175075822.

Adding to 138042130 its reverse (31240831), we get a palindrome (169282961).

The spelling of 138042130 in words is "one hundred thirty-eight million, forty-two thousand, one hundred thirty".