189930511972 has 6 divisors (see below), whose sum is σ = 332378395958. Its totient is φ = 94965255984.

The previous prime is 189930511937. The next prime is 189930511973. The reversal of 189930511972 is 279115039981.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 188300452096 + 1630059876 = 433936^2 + 40374^2 .

It is a super-3 number, since 3×189930511972³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (189930511973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23741313993 + ... + 23741314000.

Almost surely, 2^189930511972 is an apocalyptic number.

It is an amenable number.

189930511972 is a deficient number, since it is larger than the sum of its proper divisors (142447883986).

189930511972 is a wasteful number, since it uses less digits than its factorization.

189930511972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47482627997 (or 47482627995 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 55.

The spelling of 189930511972 in words is "one hundred eighty-nine billion, nine hundred thirty million, five hundred eleven thousand, nine hundred seventy-two".