1428721593 has 16 divisors (see below), whose sum is σ = 2052778560. Its totient is φ = 878664384.

The previous prime is 1428721571. The next prime is 1428721597. The reversal of 1428721593 is 3951278241.

It is not a de Polignac number, because 1428721593 - 2⁵ = 1428721561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1428721597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57018 + ... + 78156.

It is an arithmetic number, because the mean of its divisors is an integer number (128298660).

Almost surely, 2^1428721593 is an apocalyptic number.

1428721593 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1428721593 is a deficient number, since it is larger than the sum of its proper divisors (624056967).

1428721593 is a wasteful number, since it uses less digits than its factorization.

1428721593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22888.

The product of its digits is 120960, while the sum is 42.

The square root of 1428721593 is about 37798.4337373918. The cubic root of 1428721593 is about 1126.2873409472.

The spelling of 1428721593 in words is "one billion, four hundred twenty-eight million, seven hundred twenty-one thousand, five hundred ninety-three".