1290891226 has 16 divisors (see below), whose sum is σ = 2054692224. Its totient is φ = 606158784.

The previous prime is 1290891157. The next prime is 1290891241. The reversal of 1290891226 is 6221980921.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25260 + ... + 56743.

It is an arithmetic number, because the mean of its divisors is an integer number (128418264).

Almost surely, 2^1290891226 is an apocalyptic number.

1290891226 is a deficient number, since it is larger than the sum of its proper divisors (763800998).

1290891226 is a wasteful number, since it uses less digits than its factorization.

1290891226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82485.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1290891226 is about 35928.9747418431. The cubic root of 1290891226 is about 1088.8378675378.

The spelling of 1290891226 in words is "one billion, two hundred ninety million, eight hundred ninety-one thousand, two hundred twenty-six".