1387707750 has 384 divisors, whose sum is σ = 4660830720. Its totient is φ = 292896000.

The previous prime is 1387707743. The next prime is 1387707809. The reversal of 1387707750 is 577077831.

1387707750 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1387707696 and 1387707705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6113137 + ... + 6113363.

It is an arithmetic number, because the mean of its divisors is an integer number (12137580).

Almost surely, 2^1387707750 is an apocalyptic number.

1387707750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387707750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2330415360).

1387707750 is an abundant number, since it is smaller than the sum of its proper divisors (3273122970).

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

1387707750 is a wasteful number, since it uses less digits than its factorization.

1387707750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 288120, while the sum is 45.

The square root of 1387707750 is about 37251.9496134095. The cubic root of 1387707750 is about 1115.4052164554.

The spelling of 1387707750 in words is "one billion, three hundred eighty-seven million, seven hundred seven thousand, seven hundred fifty".