381157518 has 96 divisors (see below), whose sum is σ = 960339456. Its totient is φ = 98594496.

The previous prime is 381157507. The next prime is 381157519. The reversal of 381157518 is 815751183.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381157519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 348180 + ... + 349272.

It is an arithmetic number, because the mean of its divisors is an integer number (10003536).

Almost surely, 2^381157518 is an apocalyptic number.

381157518 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 381157518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (480169728).

381157518 is an abundant number, since it is smaller than the sum of its proper divisors (579181938).

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

381157518 is a wasteful number, since it uses less digits than its factorization.

381157518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166 (or 1147 counting only the distinct ones).

The product of its digits is 33600, while the sum is 39.

The square root of 381157518 is about 19523.2558247850. The cubic root of 381157518 is about 725.0503448194.

The spelling of 381157518 in words is "three hundred eighty-one million, one hundred fifty-seven thousand, five hundred eighteen".