188349690 has 32 divisors (see below), whose sum is σ = 452401920. Its totient is φ = 50186304.

The previous prime is 188349683. The next prime is 188349697. The reversal of 188349690 is 96943881.

It is an interprime number because it is at equal distance from previous prime (188349683) and next prime (188349697).

It is a super-2 number, since 2×188349690² = 70951211446192200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (188349697) 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 in 15 ways as a sum of consecutive naturals, for example, 66687 + ... + 69453.

It is an arithmetic number, because the mean of its divisors is an integer number (14137560).

Almost surely, 2^188349690 is an apocalyptic number.

188349690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188349690 is an abundant number, since it is smaller than the sum of its proper divisors (264052230).

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

188349690 is a wasteful number, since it uses less digits than its factorization.

188349690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046.

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 188349690 is about 13724.0551587350. The cubic root of 188349690 is about 573.2203983282.

The spelling of 188349690 in words is "one hundred eighty-eight million, three hundred forty-nine thousand, six hundred ninety".