1428236440 has 32 divisors (see below), whose sum is σ = 3214890000. Its totient is φ = 571053184.

The previous prime is 1428236389. The next prime is 1428236449. The reversal of 1428236440 is 446328241.

It is a junction number, because it is equal to n+sod(n) for n = 1428236396 and 1428236405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428236449) by changing a digit.

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, 111486 + ... + 123634.

Almost surely, 2^1428236440 is an apocalyptic number.

1428236440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1428236440 is an abundant number, since it is smaller than the sum of its proper divisors (1786653560).

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

1428236440 is a wasteful number, since it uses less digits than its factorization.

1428236440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15099 (or 15095 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 1428236440 is about 37792.0155588452. The cubic root of 1428236440 is about 1126.1598415224.

The spelling of 1428236440 in words is "one billion, four hundred twenty-eight million, two hundred thirty-six thousand, four hundred forty".