1211904290 has 16 divisors (see below), whose sum is σ = 2240385912. Its totient is φ = 471659904.

The previous prime is 1211904289. The next prime is 1211904299. The reversal of 1211904290 is 924091121.

It can be written as a sum of positive squares in 4 ways, for example, as 943042681 + 268861609 = 30709^2 + 16397^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1211904299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1637339 + ... + 1638078.

Almost surely, 2^1211904290 is an apocalyptic number.

1211904290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211904290 is a deficient number, since it is larger than the sum of its proper divisors (1028481622).

1211904290 is a wasteful number, since it uses less digits than its factorization.

1211904290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3275461.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1211904290 is about 34812.4157449609. The cubic root of 1211904290 is about 1066.1609563509.

The spelling of 1211904290 in words is "one billion, two hundred eleven million, nine hundred four thousand, two hundred ninety".