1999426650 has 48 divisors (see below), whose sum is σ = 5340012384. Its totient is φ = 492166080.

The previous prime is 1999426613. The next prime is 1999426657. The reversal of 1999426650 is 566249991.

It is a junction number, because it is equal to n+sod(n) for n = 1999426593 and 1999426602.

It is not an unprimeable number, because it can be changed into a prime (1999426657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 510724 + ... + 514623.

It is an arithmetic number, because the mean of its divisors is an integer number (111250258).

Almost surely, 2^1999426650 is an apocalyptic number.

1999426650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1999426650 is an abundant number, since it is smaller than the sum of its proper divisors (3340585734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999426650 is a wasteful number, since it uses less digits than its factorization.

1999426650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025375 (or 1025370 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 51.

The square root of 1999426650 is about 44714.9488426410. The cubic root of 1999426650 is about 1259.8006424325.

The spelling of 1999426650 in words is "one billion, nine hundred ninety-nine million, four hundred twenty-six thousand, six hundred fifty".