381907940 has 24 divisors (see below), whose sum is σ = 820659840. Its totient is φ = 149210208.

The previous prime is 381907909. The next prime is 381907949. The reversal of 381907940 is 49709183.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (381907949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221180 + ... + 222899.

It is an arithmetic number, because the mean of its divisors is an integer number (34194160).

Almost surely, 2^381907940 is an apocalyptic number.

It is an amenable number.

381907940 is an abundant number, since it is smaller than the sum of its proper divisors (438751900).

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

381907940 is a wasteful number, since it uses less digits than its factorization.

381907940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444131 (or 444129 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 381907940 is about 19542.4650441033. The cubic root of 381907940 is about 725.5258586810.

The spelling of 381907940 in words is "three hundred eighty-one million, nine hundred seven thousand, nine hundred forty".