1428321385 has 8 divisors (see below), whose sum is σ = 1814808456. Its totient is φ = 1075441920.

The previous prime is 1428321361. The next prime is 1428321407. The reversal of 1428321385 is 5831238241.

It can be written as a sum of positive squares in 4 ways, for example, as 81504784 + 1346816601 = 9028^2 + 36699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1428321385 - 2¹³ = 1428313193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8401806 + ... + 8401975.

It is an arithmetic number, because the mean of its divisors is an integer number (226851057).

Almost surely, 2^1428321385 is an apocalyptic number.

It is an amenable number.

1428321385 is a deficient number, since it is larger than the sum of its proper divisors (386487071).

1428321385 is a wasteful number, since it uses less digits than its factorization.

1428321385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16803803.

The product of its digits is 46080, while the sum is 37.

The square root of 1428321385 is about 37793.1393906354. The cubic root of 1428321385 is about 1126.1821673663.

The spelling of 1428321385 in words is "one billion, four hundred twenty-eight million, three hundred twenty-one thousand, three hundred eighty-five".