1290217256 has 16 divisors (see below), whose sum is σ = 2449780800. Its totient is φ = 636942384.

The previous prime is 1290217237. The next prime is 1290217259. The reversal of 1290217256 is 6527120921.

It is not an unprimeable number, because it can be changed into a prime (1290217259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020110 + ... + 1021373.

It is an arithmetic number, because the mean of its divisors is an integer number (153111300).

Almost surely, 2^1290217256 is an apocalyptic number.

It is an amenable number.

1290217256 is a deficient number, since it is larger than the sum of its proper divisors (1159563544).

1290217256 is a wasteful number, since it uses less digits than its factorization.

1290217256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041568 (or 2041564 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1290217256 is about 35919.5943184218. The cubic root of 1290217256 is about 1088.6483416783.

The spelling of 1290217256 in words is "one billion, two hundred ninety million, two hundred seventeen thousand, two hundred fifty-six".