1395781728 has 48 divisors (see below), whose sum is σ = 3997014336. Its totient is φ = 422963840.

The previous prime is 1395781711. The next prime is 1395781757. The reversal of 1395781728 is 8271875931.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 659826 + ... + 661937.

It is an arithmetic number, because the mean of its divisors is an integer number (83271132).

Almost surely, 2^1395781728 is an apocalyptic number.

It is an amenable number.

1395781728 is an abundant number, since it is smaller than the sum of its proper divisors (2601232608).

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

1395781728 is a wasteful number, since it uses less digits than its factorization.

1395781728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321787 (or 1321779 counting only the distinct ones).

The product of its digits is 846720, while the sum is 51.

The square root of 1395781728 is about 37360.1623122812. The cubic root of 1395781728 is about 1117.5642559732.

The spelling of 1395781728 in words is "one billion, three hundred ninety-five million, seven hundred eighty-one thousand, seven hundred twenty-eight".