238642649 has 4 divisors (see below), whose sum is σ = 272734464. Its totient is φ = 204550836.

The previous prime is 238642639. The next prime is 238642693. The reversal of 238642649 is 946246832.

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 not a de Polignac number, because 238642649 - 2⁴ = 238642633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238642609) 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, 17045897 + ... + 17045910.

It is an arithmetic number, because the mean of its divisors is an integer number (68183616).

Almost surely, 2^238642649 is an apocalyptic number.

It is an amenable number.

238642649 is a deficient number, since it is larger than the sum of its proper divisors (34091815).

238642649 is an equidigital number, since it uses as much as digits as its factorization.

238642649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34091814.

The product of its digits is 497664, while the sum is 44.

The square root of 238642649 is about 15448.0629530048. The cubic root of 238642649 is about 620.2727286084.

The spelling of 238642649 in words is "two hundred thirty-eight million, six hundred forty-two thousand, six hundred forty-nine".