123185285040 has 80 divisors (see below), whose sum is σ = 381909708000. Its totient is φ = 32846370816.

The previous prime is 123185284993. The next prime is 123185285051. The reversal of 123185285040 is 40582581321.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×123185285040² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123185285040.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3980346 + ... + 4011174.

It is an arithmetic number, because the mean of its divisors is an integer number (4773871350).

Almost surely, 2^123185285040 is an apocalyptic number.

123185285040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123185285040 is an abundant number, since it is smaller than the sum of its proper divisors (258724422960).

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

123185285040 is a wasteful number, since it uses less digits than its factorization.

123185285040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47494 (or 47488 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 39.

The spelling of 123185285040 in words is "one hundred twenty-three billion, one hundred eighty-five million, two hundred eighty-five thousand, forty".