385511784 has 128 divisors (see below), whose sum is σ = 1152614400. Its totient is φ = 105131520.

The previous prime is 385511783. The next prime is 385511831. The reversal of 385511784 is 487115583.

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

It is not an unprimeable number, because it can be changed into a prime (385511783) 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, 410964 + ... + 411900.

It is an arithmetic number, because the mean of its divisors is an integer number (9004800).

Almost surely, 2^385511784 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 385511784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (576307200).

385511784 is an abundant number, since it is smaller than the sum of its proper divisors (767102616).

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

385511784 is a wasteful number, since it uses less digits than its factorization.

385511784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1059 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 385511784 is about 19634.4540031038. The cubic root of 385511784 is about 727.8008401388.

The spelling of 385511784 in words is "three hundred eighty-five million, five hundred eleven thousand, seven hundred eighty-four".