1428188240 has 40 divisors (see below), whose sum is σ = 3397767648. Its totient is φ = 557988480.

The previous prime is 1428188231. The next prime is 1428188263. The reversal of 1428188240 is 428818241.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1428188194 and 1428188203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204146 + ... + 211025.

Almost surely, 2^1428188240 is an apocalyptic number.

1428188240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1428188240 is an abundant number, since it is smaller than the sum of its proper divisors (1969579408).

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

1428188240 is a wasteful number, since it uses less digits than its factorization.

1428188240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415227 (or 415221 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 38.

The square root of 1428188240 is about 37791.3778526266. The cubic root of 1428188240 is about 1126.1471728649.

The spelling of 1428188240 in words is "one billion, four hundred twenty-eight million, one hundred eighty-eight thousand, two hundred forty".