1243622090 has 16 divisors (see below), whose sum is σ = 2260685160. Its totient is φ = 492523200.

The previous prime is 1243622089. The next prime is 1243622111. The reversal of 1243622090 is 902263421.

It can be written as a sum of positive squares in 4 ways, for example, as 1231518649 + 12103441 = 35093^2 + 3479^2 .

It is a Curzon number.

It is an unprimeable number.

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, 614645 + ... + 616664.

Almost surely, 2^1243622090 is an apocalyptic number.

1243622090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1243622090 is a deficient number, since it is larger than the sum of its proper divisors (1017063070).

1243622090 is a wasteful number, since it uses less digits than its factorization.

1243622090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231417.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1243622090 is about 35265.0264426386. The cubic root of 1243622090 is about 1075.3821147450.

The spelling of 1243622090 in words is "one billion, two hundred forty-three million, six hundred twenty-two thousand, ninety".