189145720 has 32 divisors (see below), whose sum is σ = 427971600. Its totient is φ = 75232768.

The previous prime is 189145709. The next prime is 189145763. The reversal of 189145720 is 27541981.

It is a super-2 number, since 2×189145720² = 71552206788636800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 189145720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6049 + ... + 20368.

Almost surely, 2^189145720 is an apocalyptic number.

189145720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189145720 is an abundant number, since it is smaller than the sum of its proper divisors (238825880).

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

189145720 is a wasteful number, since it uses less digits than its factorization.

189145720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26607 (or 26603 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 189145720 is about 13753.0258488814. The cubic root of 189145720 is about 574.0268049496.

The spelling of 189145720 in words is "one hundred eighty-nine million, one hundred forty-five thousand, seven hundred twenty".