189307987977 has 8 divisors (see below), whose sum is σ = 254644373664. Its totient is φ = 125088463808.

The previous prime is 189307987961. The next prime is 189307988057. The reversal of 189307987977 is 779789703981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189307987977 - 2⁴ = 189307987961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189307987899 and 189307987908.

It is not an unprimeable number, because it can be changed into a prime (189307987927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279214983 + ... + 279215660.

It is an arithmetic number, because the mean of its divisors is an integer number (31830546708).

Almost surely, 2^189307987977 is an apocalyptic number.

It is an amenable number.

189307987977 is a deficient number, since it is larger than the sum of its proper divisors (65336385687).

189307987977 is a wasteful number, since it uses less digits than its factorization.

189307987977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558430759.

The product of its (nonzero) digits is 336063168, while the sum is 75.

The spelling of 189307987977 in words is "one hundred eighty-nine billion, three hundred seven million, nine hundred eighty-seven thousand, nine hundred seventy-seven".