381165540 has 96 divisors (see below), whose sum is σ = 1223389440. Its totient is φ = 86862336.

The previous prime is 381165539. The next prime is 381165569. The reversal of 381165540 is 45561183.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162214 + ... + 164546.

It is an arithmetic number, because the mean of its divisors is an integer number (12743640).

Almost surely, 2^381165540 is an apocalyptic number.

381165540 is a gapful number since it is divisible by the number (30) 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 381165540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (611694720).

381165540 is an abundant number, since it is smaller than the sum of its proper divisors (842223900).

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

381165540 is a wasteful number, since it uses less digits than its factorization.

381165540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741 (or 2739 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 381165540 is about 19523.4612709939. The cubic root of 381165540 is about 725.0554313543.

The spelling of 381165540 in words is "three hundred eighty-one million, one hundred sixty-five thousand, five hundred forty".