381645342 has 96 divisors (see below), whose sum is σ = 949620672. Its totient is φ = 109734912.

The previous prime is 381645331. The next prime is 381645347. The reversal of 381645342 is 243546183.

381645342 is a `hidden beast` number, since 3 + 8 + 1 + 645 + 3 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 381645297 and 381645306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381645347) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 783423 + ... + 783909.

It is an arithmetic number, because the mean of its divisors is an integer number (9891882).

Almost surely, 2^381645342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381645342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474810336).

381645342 is an abundant number, since it is smaller than the sum of its proper divisors (567975330).

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

381645342 is a wasteful number, since it uses less digits than its factorization.

381645342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 719 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 381645342 is about 19535.7452378966. The cubic root of 381645342 is about 725.3595312293.

The spelling of 381645342 in words is "three hundred eighty-one million, six hundred forty-five thousand, three hundred forty-two".