188145404 has 6 divisors (see below), whose sum is σ = 329254464. Its totient is φ = 94072700.

The previous prime is 188145401. The next prime is 188145413. The reversal of 188145404 is 404541881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188145401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23518172 + ... + 23518179.

It is an arithmetic number, because the mean of its divisors is an integer number (54875744).

Almost surely, 2^188145404 is an apocalyptic number.

It is an amenable number.

188145404 is a deficient number, since it is larger than the sum of its proper divisors (141109060).

188145404 is a wasteful number, since it uses less digits than its factorization.

188145404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47036355 (or 47036353 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 35.

The square root of 188145404 is about 13716.6105142634. The cubic root of 188145404 is about 573.0130831227.

The spelling of 188145404 in words is "one hundred eighty-eight million, one hundred forty-five thousand, four hundred four".