1290421768 has 16 divisors (see below), whose sum is σ = 2484934380. Its totient is φ = 627772608.

The previous prime is 1290421757. The next prime is 1290421777. The reversal of 1290421768 is 8671240921.

It can be written as a sum of positive squares in 2 ways, for example, as 1290390084 + 31684 = 35922^2 + 178^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1290421768.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2179471 + ... + 2180062.

Almost surely, 2^1290421768 is an apocalyptic number.

It is an amenable number.

1290421768 is a deficient number, since it is larger than the sum of its proper divisors (1194512612).

1290421768 is a wasteful number, since it uses less digits than its factorization.

1290421768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4359576 (or 4359572 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1290421768 is about 35922.4410083725. The cubic root of 1290421768 is about 1088.7058590941.

The spelling of 1290421768 in words is "one billion, two hundred ninety million, four hundred twenty-one thousand, seven hundred sixty-eight".