1290666440 has 32 divisors (see below), whose sum is σ = 3318857280. Its totient is φ = 442514112.

The previous prime is 1290666397. The next prime is 1290666467. The reversal of 1290666440 is 446660921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1290666394 and 1290666403.

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, 2304482 + ... + 2305041.

It is an arithmetic number, because the mean of its divisors is an integer number (103714290).

Almost surely, 2^1290666440 is an apocalyptic number.

1290666440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1290666440 is an abundant number, since it is smaller than the sum of its proper divisors (2028190840).

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

1290666440 is a wasteful number, since it uses less digits than its factorization.

1290666440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4609541 (or 4609537 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 1290666440 is about 35925.8464061739. The cubic root of 1290666440 is about 1088.7746632151.

The spelling of 1290666440 in words is "one billion, two hundred ninety million, six hundred sixty-six thousand, four hundred forty".