1209999950 has 12 divisors (see below), whose sum is σ = 2250600000. Its totient is φ = 483999960.

The previous prime is 1209999943. The next prime is 1209999997. The reversal of 1209999950 is 599999021.

It is a junction number, because it is equal to n+sod(n) for n = 1209999892 and 1209999901.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 12099950 + ... + 12100049.

It is an arithmetic number, because the mean of its divisors is an integer number (187550000).

Almost surely, 2^1209999950 is an apocalyptic number.

1209999950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1209999950 is a deficient number, since it is larger than the sum of its proper divisors (1040600050).

1209999950 is a wasteful number, since it uses less digits than its factorization.

1209999950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24200011 (or 24200006 counting only the distinct ones).

The product of its (nonzero) digits is 590490, while the sum is 53.

The square root of 1209999950 is about 34785.0535431527. The cubic root of 1209999950 is about 1065.6022220889.

The spelling of 1209999950 in words is "one billion, two hundred nine million, nine hundred ninety-nine thousand, nine hundred fifty".