238640777 has 4 divisors (see below), whose sum is σ = 238675200. Its totient is φ = 238606356.

The previous prime is 238640771. The next prime is 238640791. The reversal of 238640777 is 777046832.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 238640777 - 2¹² = 238636681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238640771) 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, 2777 + ... + 22022.

It is an arithmetic number, because the mean of its divisors is an integer number (59668800).

Almost surely, 2^238640777 is an apocalyptic number.

It is an amenable number.

238640777 is a deficient number, since it is larger than the sum of its proper divisors (34423).

238640777 is an equidigital number, since it uses as much as digits as its factorization.

238640777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34422.

The product of its (nonzero) digits is 395136, while the sum is 44.

The square root of 238640777 is about 15448.0023627652. The cubic root of 238640777 is about 620.2711067223.

The spelling of 238640777 in words is "two hundred thirty-eight million, six hundred forty thousand, seven hundred seventy-seven".