1389552750 has 48 divisors (see below), whose sum is σ = 3757356720. Its totient is φ = 370546800.

The previous prime is 1389552727. The next prime is 1389552757. The reversal of 1389552750 is 572559831.

1389552750 is a `hidden beast` number, since 1 + 38 + 95 + 527 + 5 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 = 1389552696 and 1389552705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389552757) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306540 + ... + 311039.

It is an arithmetic number, because the mean of its divisors is an integer number (78278265).

Almost surely, 2^1389552750 is an apocalyptic number.

1389552750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1389552750 is an abundant number, since it is smaller than the sum of its proper divisors (2367803970).

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

1389552750 is a wasteful number, since it uses less digits than its factorization.

1389552750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617602 (or 617589 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The square root of 1389552750 is about 37276.7051923852. The cubic root of 1389552750 is about 1115.8993193560.

The spelling of 1389552750 in words is "one billion, three hundred eighty-nine million, five hundred fifty-two thousand, seven hundred fifty".