238720837 has 4 divisors (see below), whose sum is σ = 246952620. Its totient is φ = 230489056.

The previous prime is 238720813. The next prime is 238720843. The reversal of 238720837 is 738027832.

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

It can be written as a sum of positive squares in 2 ways, for example, as 177662241 + 61058596 = 13329^2 + 7814^2 .

It is a cyclic number.

It is not a de Polignac number, because 238720837 - 2⁷ = 238720709 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 238720837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238720847) 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, 4115848 + ... + 4115905.

It is an arithmetic number, because the mean of its divisors is an integer number (61738155).

Almost surely, 2^238720837 is an apocalyptic number.

It is an amenable number.

238720837 is a deficient number, since it is larger than the sum of its proper divisors (8231783).

238720837 is an equidigital number, since it uses as much as digits as its factorization.

238720837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8231782.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 238720837 is about 15450.5934190244. The cubic root of 238720837 is about 620.3404625036.

The spelling of 238720837 in words is "two hundred thirty-eight million, seven hundred twenty thousand, eight hundred thirty-seven".