238720137 has 16 divisors (see below), whose sum is σ = 340116480. Its totient is φ = 148407552.

The previous prime is 238720127. The next prime is 238720169. The reversal of 238720137 is 731027832.

It is not a de Polignac number, because 238720137 - 2⁶ = 238720073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 238720098 and 238720107.

It is not an unprimeable number, because it can be changed into a prime (238720117) by changing a digit.

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, 15913 + ... + 27030.

It is an arithmetic number, because the mean of its divisors is an integer number (21257280).

Almost surely, 2^238720137 is an apocalyptic number.

It is an amenable number.

238720137 is a deficient number, since it is larger than the sum of its proper divisors (101396343).

238720137 is a wasteful number, since it uses less digits than its factorization.

238720137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43072.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 238720137 is about 15450.5707661562. The cubic root of 238720137 is about 620.3398561625.

Adding to 238720137 its reverse (731027832), we get a palindrome (969747969).

The spelling of 238720137 in words is "two hundred thirty-eight million, seven hundred twenty thousand, one hundred thirty-seven".