238137940 has 12 divisors (see below), whose sum is σ = 500089716. Its totient is φ = 95255168.

The previous prime is 238137931. The next prime is 238137941. The reversal of 238137940 is 49731832.

It can be written as a sum of positive squares in 2 ways, for example, as 129686544 + 108451396 = 11388^2 + 10414^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 238137940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238137941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5953429 + ... + 5953468.

It is an arithmetic number, because the mean of its divisors is an integer number (41674143).

Almost surely, 2^238137940 is an apocalyptic number.

238137940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

238137940 is an abundant number, since it is smaller than the sum of its proper divisors (261951776).

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

238137940 is a wasteful number, since it uses less digits than its factorization.

238137940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11906906 (or 11906904 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 238137940 is about 15431.7186340343. The cubic root of 238137940 is about 619.8351452090.

The spelling of 238137940 in words is "two hundred thirty-eight million, one hundred thirty-seven thousand, nine hundred forty".