19443497890 has 32 divisors (see below), whose sum is σ = 37121430384. Its totient is φ = 7307182080.

The previous prime is 19443497881. The next prime is 19443497911. The reversal of 19443497890 is 9879434491.

It can be written as a sum of positive squares in 8 ways, for example, as 19443234721 + 263169 = 139439^2 + 513^2 .

It is a super-2 number, since 2×19443497890² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1021 + ... + 197200.

Almost surely, 2^19443497890 is an apocalyptic number.

19443497890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19443497890 is a deficient number, since it is larger than the sum of its proper divisors (17677932494).

19443497890 is a wasteful number, since it uses less digits than its factorization.

19443497890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198822.

The product of its (nonzero) digits is 7838208, while the sum is 58.

The spelling of 19443497890 in words is "nineteen billion, four hundred forty-three million, four hundred ninety-seven thousand, eight hundred ninety".