238630640 has 20 divisors (see below), whose sum is σ = 554816424. Its totient is φ = 95452224.

The previous prime is 238630621. The next prime is 238630643. The reversal of 238630640 is 46036832.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 238630597 and 238630606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238630643) 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, 1491362 + ... + 1491521.

Almost surely, 2^238630640 is an apocalyptic number.

238630640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

238630640 is an abundant number, since it is smaller than the sum of its proper divisors (316185784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

238630640 is a wasteful number, since it uses less digits than its factorization.

238630640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982896 (or 2982890 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 238630640 is about 15447.6742586061. The cubic root of 238630640 is about 620.2623239578.

The spelling of 238630640 in words is "two hundred thirty-eight million, six hundred thirty thousand, six hundred forty".