380921856 has 192 divisors, whose sum is σ = 1231251840. Its totient is φ = 102236160.

The previous prime is 380921851. The next prime is 380921911. The reversal of 380921856 is 658129083.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (380921851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730876 + ... + 731396.

It is an arithmetic number, because the mean of its divisors is an integer number (6412770).

Almost surely, 2^380921856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 380921856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (615625920).

380921856 is an abundant number, since it is smaller than the sum of its proper divisors (850329984).

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

380921856 is a wasteful number, since it uses less digits than its factorization.

380921856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 380921856 is about 19517.2194740952. The cubic root of 380921856 is about 724.9008860149.

The spelling of 380921856 in words is "three hundred eighty million, nine hundred twenty-one thousand, eight hundred fifty-six".