1428715873 has 4 divisors (see below), whose sum is σ = 1538617108. Its totient is φ = 1318814640.

The previous prime is 1428715867. The next prime is 1428715907. The reversal of 1428715873 is 3785178241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 532132624 + 896583249 = 23068^2 + 29943^2 .

It is not a de Polignac number, because 1428715873 - 2⁹ = 1428715361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428715273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54950598 + ... + 54950623.

It is an arithmetic number, because the mean of its divisors is an integer number (384654277).

Almost surely, 2^1428715873 is an apocalyptic number.

1428715873 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1428715873 is a deficient number, since it is larger than the sum of its proper divisors (109901235).

1428715873 is a wasteful number, since it uses less digits than its factorization.

1428715873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109901234.

The product of its digits is 376320, while the sum is 46.

The square root of 1428715873 is about 37798.3580728052. The cubic root of 1428715873 is about 1126.2858378850.

The spelling of 1428715873 in words is "one billion, four hundred twenty-eight million, seven hundred fifteen thousand, eight hundred seventy-three".