1428940784 has 40 divisors (see below), whose sum is σ = 2876958720. Its totient is φ = 686808000.

The previous prime is 1428940781. The next prime is 1428940789. The reversal of 1428940784 is 4870498241.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428940781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65357 + ... + 84435.

It is an arithmetic number, because the mean of its divisors is an integer number (71923968).

Almost surely, 2^1428940784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1428940784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1438479360).

1428940784 is an abundant number, since it is smaller than the sum of its proper divisors (1448017936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1428940784 is a wasteful number, since it uses less digits than its factorization.

1428940784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19269 (or 19263 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The square root of 1428940784 is about 37801.3330981858. Note that the first 3 decimals coincide. The cubic root of 1428940784 is about 1126.3449354256.

The spelling of 1428940784 in words is "one billion, four hundred twenty-eight million, nine hundred forty thousand, seven hundred eighty-four".