19898343634 has 16 divisors (see below), whose sum is σ = 34034271768. Its totient is φ = 8643624192.

The previous prime is 19898343613. The next prime is 19898343637. The reversal of 19898343634 is 43634389891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15649259409 + 4249084225 = 125097^2 + 65185^2 .

It is not an unprimeable number, because it can be changed into a prime (19898343637) by changing a digit.

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, 22508997 + ... + 22509880.

Almost surely, 2^19898343634 is an apocalyptic number.

19898343634 is a deficient number, since it is larger than the sum of its proper divisors (14135928134).

19898343634 is a wasteful number, since it uses less digits than its factorization.

19898343634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45018909.

The product of its digits is 13436928, while the sum is 58.

The spelling of 19898343634 in words is "nineteen billion, eight hundred ninety-eight million, three hundred forty-three thousand, six hundred thirty-four".