385591640 has 96 divisors (see below), whose sum is σ = 1025252640. Its totient is φ = 127848960.

The previous prime is 385591631. The next prime is 385591651. The reversal of 385591640 is 46195583.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 268364 + ... + 269796.

It is an arithmetic number, because the mean of its divisors is an integer number (10679715).

Almost surely, 2^385591640 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 385591640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512626320).

385591640 is an abundant number, since it is smaller than the sum of its proper divisors (639661000).

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

385591640 is a wasteful number, since it uses less digits than its factorization.

385591640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513 (or 1478 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 385591640 is about 19636.4874659395. The cubic root of 385591640 is about 727.8510895767.

The spelling of 385591640 in words is "three hundred eighty-five million, five hundred ninety-one thousand, six hundred forty".