123595013840 has 20 divisors (see below), whose sum is σ = 287358407364. Its totient is φ = 49438005504.

The previous prime is 123595013803. The next prime is 123595013879. The reversal of 123595013840 is 48310595321.

It can be written as a sum of positive squares in 2 ways, for example, as 32878392976 + 90716620864 = 181324^2 + 301192^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×123595013840² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772468757 + ... + 772468916.

Almost surely, 2^123595013840 is an apocalyptic number.

123595013840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123595013840 is an abundant number, since it is smaller than the sum of its proper divisors (163763393524).

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

123595013840 is a wasteful number, since it uses less digits than its factorization.

123595013840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544937686 (or 1544937680 counting only the distinct ones).

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

The spelling of 123595013840 in words is "one hundred twenty-three billion, five hundred ninety-five million, thirteen thousand, eight hundred forty".