1428111 has 16 divisors (see below), whose sum is σ = 2145120. Its totient is φ = 950616.

The previous prime is 1428109. The next prime is 1428113. The reversal of 1428111 is 1118241.

It is an interprime number because it is at equal distance from previous prime (1428109) and next prime (1428113).

It is not a de Polignac number, because 1428111 - 2¹ = 1428109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428113) 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, 1861 + ... + 2513.

It is an arithmetic number, because the mean of its divisors is an integer number (134070).

2^1428111 is an apocalyptic number.

1428111 is a deficient number, since it is larger than the sum of its proper divisors (717009).

1428111 is an frugal number, since it uses more digits than its factorization.

1428111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 656 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

The square root of 1428111 is about 1195.0359827219. The cubic root of 1428111 is about 112.6126870878.

The spelling of 1428111 in words is "one million, four hundred twenty-eight thousand, one hundred eleven".