189220788 has 36 divisors (see below), whose sum is σ = 486420480. Its totient is φ = 62003856.

The previous prime is 189220783. The next prime is 189220789. The reversal of 189220788 is 887022981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×189220788² = 71609013222681888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189220783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42420 + ... + 46667.

It is an arithmetic number, because the mean of its divisors is an integer number (13511680).

Almost surely, 2^189220788 is an apocalyptic number.

189220788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

189220788 is an abundant number, since it is smaller than the sum of its proper divisors (297199692).

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

189220788 is a wasteful number, since it uses less digits than its factorization.

189220788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89156 (or 89151 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 189220788 is about 13755.7547230241. The cubic root of 189220788 is about 574.1027346698.

The spelling of 189220788 in words is "one hundred eighty-nine million, two hundred twenty thousand, seven hundred eighty-eight".