1385653638840 has 256 divisors, whose sum is σ = 4391859916800. Its totient is φ = 349202380800.

The previous prime is 1385653638821. The next prime is 1385653638851. The reversal of 1385653638840 is 488363565831.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 79484925 + ... + 79502355.

It is an arithmetic number, because the mean of its divisors is an integer number (17155702800).

Almost surely, 2^{1385653638840} is an apocalyptic number.

1385653638840 is a gapful number since it is divisible by the number (10) 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 1385653638840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2195929958400).

1385653638840 is an abundant number, since it is smaller than the sum of its proper divisors (3006206277960).

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

1385653638840 is a wasteful number, since it uses less digits than its factorization.

1385653638840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17958 (or 17954 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 60.

The spelling of 1385653638840 in words is "one trillion, three hundred eighty-five billion, six hundred fifty-three million, six hundred thirty-eight thousand, eight hundred forty".