1388875020 has 192 divisors, whose sum is σ = 4389396480. Its totient is φ = 325785600.

The previous prime is 1388875013. The next prime is 1388875099. The reversal of 1388875020 is 205788831.

It is a happy 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, 1716376 + ... + 1717184.

It is an arithmetic number, because the mean of its divisors is an integer number (22861440).

Almost surely, 2^1388875020 is an apocalyptic number.

1388875020 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 1388875020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2194698240).

1388875020 is an abundant number, since it is smaller than the sum of its proper divisors (3000521460).

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

1388875020 is a wasteful number, since it uses less digits than its factorization.

1388875020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 1388875020 is about 37267.6135538620. The cubic root of 1388875020 is about 1115.7178697414.

The spelling of 1388875020 in words is "one billion, three hundred eighty-eight million, eight hundred seventy-five thousand, twenty".