1428687193 has 4 divisors (see below), whose sum is σ = 1428905268. Its totient is φ = 1428469120.

The previous prime is 1428687181. The next prime is 1428687199. The reversal of 1428687193 is 3917868241.

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 1148057689 + 280629504 = 33883^2 + 16752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428687193 is a prime.

It is a super-2 number, since 2×1428687193² = 4082294190884438498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428687199) 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, 98896 + ... + 112417.

It is an arithmetic number, because the mean of its divisors is an integer number (357226317).

Almost surely, 2^1428687193 is an apocalyptic number.

It is an amenable number.

1428687193 is a deficient number, since it is larger than the sum of its proper divisors (218075).

1428687193 is an equidigital number, since it uses as much as digits as its factorization.

1428687193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218074.

The product of its digits is 580608, while the sum is 49.

The square root of 1428687193 is about 37797.9786893426. The cubic root of 1428687193 is about 1126.2783014918.

The spelling of 1428687193 in words is "one billion, four hundred twenty-eight million, six hundred eighty-seven thousand, one hundred ninety-three".