238739861 has 8 divisors (see below), whose sum is σ = 249420600. Its totient is φ = 228222400.

The previous prime is 238739821. The next prime is 238739863. The reversal of 238739861 is 168937832.

It can be written as a sum of positive squares in 4 ways, for example, as 137334961 + 101404900 = 11719^2 + 10070^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238739861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238739863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37826 + ... + 43683.

It is an arithmetic number, because the mean of its divisors is an integer number (31177575).

Almost surely, 2^238739861 is an apocalyptic number.

It is an amenable number.

238739861 is a deficient number, since it is larger than the sum of its proper divisors (10680739).

238739861 is a wasteful number, since it uses less digits than its factorization.

238739861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81639.

The product of its digits is 435456, while the sum is 47.

The square root of 238739861 is about 15451.2090465439. The cubic root of 238739861 is about 620.3569406679.

The spelling of 238739861 in words is "two hundred thirty-eight million, seven hundred thirty-nine thousand, eight hundred sixty-one".