19489835236 has 45 divisors (see below), whose sum is σ = 35756058751. Its totient is φ = 9295525904.

The previous prime is 19489835231. The next prime is 19489835303. The reversal of 19489835236 is 63253898491.

The square root of 19489835236 is 139606.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 46321636 + 19443513600 = 6806^2 + 139440^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19489835231) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 234817251 + ... + 234817333.

Almost surely, 2^19489835236 is an apocalyptic number.

19489835236 is the 139606-th square number.

It is an amenable number.

19489835236 is a deficient number, since it is larger than the sum of its proper divisors (16266223515).

19489835236 is an frugal number, since it uses more digits than its factorization.

19489835236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 114 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 58.

The spelling of 19489835236 in words is "nineteen billion, four hundred eighty-nine million, eight hundred thirty-five thousand, two hundred thirty-six".