189477986418 has 54 divisors (see below), whose sum is σ = 477594448461. Its totient is φ = 54132873984.

The previous prime is 189477986417. The next prime is 189477986437. The reversal of 189477986418 is 814689774981.

189477986418 is a `hidden beast` number, since 1 + 8 + 9 + 477 + 98 + 64 + 1 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 107225467209 + 82252519209 = 327453^2 + 286797^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=307797.

It is a super-3 number, since 3×189477986418³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (189477986413) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12920146 + ... + 12934802.

Almost surely, 2^189477986418 is an apocalyptic number.

189477986418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

189477986418 is an abundant number, since it is smaller than the sum of its proper divisors (288116462043).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189477986418 is an frugal number, since it uses more digits than its factorization.

189477986418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29336 (or 14669 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 72.

Multiplying 189477986418 by its sum of digits (72), we get a square (13642415022096 = 3693564²).

The spelling of 189477986418 in words is "one hundred eighty-nine billion, four hundred seventy-seven million, nine hundred eighty-six thousand, four hundred eighteen".