1428851391 has 16 divisors (see below), whose sum is σ = 2103373440. Its totient is φ = 855535520.

The previous prime is 1428851387. The next prime is 1428851393. The reversal of 1428851391 is 1931588241.

It is a cyclic number.

It is not a de Polignac number, because 1428851391 - 2² = 1428851387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428851393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258096 + ... + 263573.

It is an arithmetic number, because the mean of its divisors is an integer number (131460840).

Almost surely, 2^1428851391 is an apocalyptic number.

1428851391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1428851391 is a deficient number, since it is larger than the sum of its proper divisors (674522049).

1428851391 is a wasteful number, since it uses less digits than its factorization.

1428851391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521766.

The product of its digits is 69120, while the sum is 42.

The square root of 1428851391 is about 37800.1506743029. The cubic root of 1428851391 is about 1126.3214472928.

The spelling of 1428851391 in words is "one billion, four hundred twenty-eight million, eight hundred fifty-one thousand, three hundred ninety-one".