385134816840 has 128 divisors (see below), whose sum is σ = 1191538252800. Its totient is φ = 99539767040.

The previous prime is 385134816827. The next prime is 385134816853. The reversal of 385134816840 is 48618431583.

It is an interprime number because it is at equal distance from previous prime (385134816827) and next prime (385134816853).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119599 + ... + 885761.

It is an arithmetic number, because the mean of its divisors is an integer number (9308892600).

Almost surely, 2^385134816840 is an apocalyptic number.

385134816840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 385134816840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (595769126400).

385134816840 is an abundant number, since it is smaller than the sum of its proper divisors (806403435960).

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

385134816840 is a wasteful number, since it uses less digits than its factorization.

385134816840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766307 (or 766303 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 385134816840 in words is "three hundred eighty-five billion, one hundred thirty-four million, eight hundred sixteen thousand, eight hundred forty".