238685440 has 144 divisors (see below), whose sum is σ = 692278272. Its totient is φ = 76972032.

The previous prime is 238685431. The next prime is 238685443. The reversal of 238685440 is 44586832.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 238685393 and 238685402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238685443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151537 + ... + 153103.

It is an arithmetic number, because the mean of its divisors is an integer number (4807488).

Almost surely, 2^238685440 is an apocalyptic number.

238685440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 238685440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346139136).

238685440 is an abundant number, since it is smaller than the sum of its proper divisors (453592832).

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

238685440 is a wasteful number, since it uses less digits than its factorization.

238685440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612 (or 1598 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The square root of 238685440 is about 15449.4478865751. The cubic root of 238685440 is about 620.3098000822.

The spelling of 238685440 in words is "two hundred thirty-eight million, six hundred eighty-five thousand, four hundred forty".