123398798544 has 320 divisors, whose sum is σ = 416259072000. Its totient is φ = 34269184512.

The previous prime is 123398798527. The next prime is 123398798563. The reversal of 123398798544 is 445897893321.

123398798544 is a `hidden beast` number, since 1 + 2 + 3 + 3 + 9 + 87 + 9 + 8 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21174159 + ... + 21179985.

It is an arithmetic number, because the mean of its divisors is an integer number (1300809600).

Almost surely, 2^123398798544 is an apocalyptic number.

123398798544 is a gapful number since it is divisible by the number (14) 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 123398798544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208129536000).

123398798544 is an abundant number, since it is smaller than the sum of its proper divisors (292860273456).

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

123398798544 is a wasteful number, since it uses less digits than its factorization.

123398798544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6047 (or 6035 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 123398798544 in words is "one hundred twenty-three billion, three hundred ninety-eight million, seven hundred ninety-eight thousand, five hundred forty-four".