238720138 has 4 divisors (see below), whose sum is σ = 358080210. Its totient is φ = 119360068.

The previous prime is 238720127. The next prime is 238720169. The reversal of 238720138 is 831027832.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 233998209 + 4721929 = 15297^2 + 2173^2 .

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 as a sum of consecutive naturals, namely, 59680033 + ... + 59680036.

Almost surely, 2^238720138 is an apocalyptic number.

238720138 is a deficient number, since it is larger than the sum of its proper divisors (119360072).

238720138 is a wasteful number, since it uses less digits than its factorization.

238720138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119360071.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 238720138 is about 15450.5707985174. The cubic root of 238720138 is about 620.3398570287.

The spelling of 238720138 in words is "two hundred thirty-eight million, seven hundred twenty thousand, one hundred thirty-eight".