188977145 has 16 divisors (see below), whose sum is σ = 259469568. Its totient is φ = 129433920.

The previous prime is 188977141. The next prime is 188977153. The reversal of 188977145 is 541779881.

It is not a de Polignac number, because 188977145 - 2² = 188977141 is a prime.

It is a super-2 number, since 2×188977145² = 71424722664702050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 188977093 and 188977102.

It is not an unprimeable number, because it can be changed into a prime (188977141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33467 + ... + 38703.

It is an arithmetic number, because the mean of its divisors is an integer number (16216848).

Almost surely, 2^188977145 is an apocalyptic number.

It is an amenable number.

188977145 is a deficient number, since it is larger than the sum of its proper divisors (70492423).

188977145 is a wasteful number, since it uses less digits than its factorization.

188977145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6280.

The product of its digits is 564480, while the sum is 50.

The square root of 188977145 is about 13746.8958314232. The cubic root of 188977145 is about 573.8562216018.

The spelling of 188977145 in words is "one hundred eighty-eight million, nine hundred seventy-seven thousand, one hundred forty-five".