385581500 has 24 divisors (see below), whose sum is σ = 842111088. Its totient is φ = 154232400.

The previous prime is 385581491. The next prime is 385581509. The reversal of 385581500 is 5185583.

It is an interprime number because it is at equal distance from previous prime (385581491) and next prime (385581509).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385581509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385082 + ... + 386081.

It is an arithmetic number, because the mean of its divisors is an integer number (35087962).

Almost surely, 2^385581500 is an apocalyptic number.

It is an amenable number.

385581500 is an abundant number, since it is smaller than the sum of its proper divisors (456529588).

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

385581500 is a wasteful number, since it uses less digits than its factorization.

385581500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771182 (or 771170 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 385581500 is about 19636.2292714258. The cubic root of 385581500 is about 727.8447093599.

The spelling of 385581500 in words is "three hundred eighty-five million, five hundred eighty-one thousand, five hundred".