238897985 has 4 divisors (see below), whose sum is σ = 286677588. Its totient is φ = 191118384.

The previous prime is 238897979. The next prime is 238897993. The reversal of 238897985 is 589798832.

238897985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 131423296 + 107474689 = 11464^2 + 10367^2 .

It is a cyclic number.

It is not a de Polignac number, because 238897985 - 2²² = 234703681 is a prime.

It is a super-3 number, since 3×238897985³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23889794 + ... + 23889803.

It is an arithmetic number, because the mean of its divisors is an integer number (71669397).

Almost surely, 2^238897985 is an apocalyptic number.

It is an amenable number.

238897985 is a deficient number, since it is larger than the sum of its proper divisors (47779603).

238897985 is an equidigital number, since it uses as much as digits as its factorization.

238897985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47779602.

The product of its digits is 8709120, while the sum is 59.

The square root of 238897985 is about 15456.3250806911. The cubic root of 238897985 is about 620.4938702835.

The spelling of 238897985 in words is "two hundred thirty-eight million, eight hundred ninety-seven thousand, nine hundred eighty-five".