1290216706 has 4 divisors (see below), whose sum is σ = 1935325062. Its totient is φ = 645108352.

The previous prime is 1290216701. The next prime is 1290216731. The reversal of 1290216706 is 6076120921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 829728025 + 460488681 = 28805^2 + 21459^2 .

It is not an unprimeable number, because it can be changed into a prime (1290216701) by changing a digit.

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 as a sum of consecutive naturals, namely, 322554175 + ... + 322554178.

Almost surely, 2^1290216706 is an apocalyptic number.

1290216706 is a deficient number, since it is larger than the sum of its proper divisors (645108356).

1290216706 is an equidigital number, since it uses as much as digits as its factorization.

1290216706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645108355.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1290216706 is about 35919.5866624325. The cubic root of 1290216706 is about 1088.6481869869.

The spelling of 1290216706 in words is "one billion, two hundred ninety million, two hundred sixteen thousand, seven hundred six".