380291646 has 64 divisors (see below), whose sum is σ = 908812800. Its totient is φ = 105981120.

The previous prime is 380291627. The next prime is 380291647. The reversal of 380291646 is 646192083.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (380291647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82125 + ... + 86631.

It is an arithmetic number, because the mean of its divisors is an integer number (14200200).

Almost surely, 2^380291646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 380291646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (454406400).

380291646 is an abundant number, since it is smaller than the sum of its proper divisors (528521154).

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

380291646 is a wasteful number, since it uses less digits than its factorization.

380291646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4574 (or 4560 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 380291646 is about 19501.0678169171. The cubic root of 380291646 is about 724.5008985029.

The spelling of 380291646 in words is "three hundred eighty million, two hundred ninety-one thousand, six hundred forty-six".