1284685440 has 64 divisors (see below), whose sum is σ = 4094940960. Its totient is φ = 342582272.

The previous prime is 1284685417. The next prime is 1284685459. The reversal of 1284685440 is 445864821.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1284685392 and 1284685401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332634 + ... + 336473.

Almost surely, 2^1284685440 is an apocalyptic number.

1284685440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1284685440 is an abundant number, since it is smaller than the sum of its proper divisors (2810255520).

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

1284685440 is an equidigital number, since it uses as much as digits as its factorization.

1284685440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669129 (or 669117 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 42.

The square root of 1284685440 is about 35842.5088407606. The cubic root of 1284685440 is about 1087.0902501781.

The spelling of 1284685440 in words is "one billion, two hundred eighty-four million, six hundred eighty-five thousand, four hundred forty".