12345899890 has 16 divisors (see below), whose sum is σ = 22823231832. Its totient is φ = 4804890624.

The previous prime is 12345899873. The next prime is 12345899899. The reversal of 12345899890 is 9899854321.

It can be written as a sum of positive squares in 4 ways, for example, as 12105060529 + 240839361 = 110023^2 + 15519^2 .

It is not an unprimeable number, because it can be changed into a prime (12345899899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16683279 + ... + 16684018.

Almost surely, 2^12345899890 is an apocalyptic number.

12345899890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12345899890 is a deficient number, since it is larger than the sum of its proper divisors (10477331942).

12345899890 is a wasteful number, since it uses less digits than its factorization.

12345899890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33367341.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The spelling of 12345899890 in words is "twelve billion, three hundred forty-five million, eight hundred ninety-nine thousand, eight hundred ninety".