19989023405235 has 16 divisors (see below), whose sum is σ = 31985369458080. Its totient is φ = 10659835146240.

The previous prime is 19989023405233. The next prime is 19989023405327. The reversal of 19989023405235 is 53250432098991.

It is not a de Polignac number, because 19989023405235 - 2¹ = 19989023405233 is a prime.

It is a super-2 number, since 2×19989023405235² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19989023405233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60914446 + ... + 61241715.

It is an arithmetic number, because the mean of its divisors is an integer number (1999085591130).

Almost surely, 2^{19989023405235} is an apocalyptic number.

19989023405235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19989023405235 is a deficient number, since it is larger than the sum of its proper divisors (11996346052845).

19989023405235 is a wasteful number, since it uses less digits than its factorization.

19989023405235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122167078.

The product of its (nonzero) digits is 20995200, while the sum is 60.

The spelling of 19989023405235 in words is "nineteen trillion, nine hundred eighty-nine billion, twenty-three million, four hundred five thousand, two hundred thirty-five".