1395989280 has 576 divisors, whose sum is σ = 5915669760. Its totient is φ = 292626432.

The previous prime is 1395989263. The next prime is 1395989321. The reversal of 1395989280 is 829895931.

1395989280 is a `hidden beast` number, since 1 + 395 + 98 + 92 + 80 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7086142 + ... + 7086338.

It is an arithmetic number, because the mean of its divisors is an integer number (10270260).

Almost surely, 2^1395989280 is an apocalyptic number.

1395989280 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 1395989280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2957834880).

1395989280 is an abundant number, since it is smaller than the sum of its proper divisors (4519680480).

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

1395989280 is a wasteful number, since it uses less digits than its factorization.

1395989280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The square root of 1395989280 is about 37362.9399271524. The cubic root of 1395989280 is about 1117.6196469644.

The spelling of 1395989280 in words is "one billion, three hundred ninety-five million, nine hundred eighty-nine thousand, two hundred eighty".