189617440 has 24 divisors (see below), whose sum is σ = 447971580. Its totient is φ = 75846912.

The previous prime is 189617383. The next prime is 189617447. The reversal of 189617440 is 44716981.

It can be written as a sum of positive squares in 2 ways, for example, as 189447696 + 169744 = 13764^2 + 412^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 189617393 and 189617402.

It is not an unprimeable number, because it can be changed into a prime (189617447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 592395 + ... + 592714.

Almost surely, 2^189617440 is an apocalyptic number.

189617440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189617440 is an abundant number, since it is smaller than the sum of its proper divisors (258354140).

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

189617440 is a wasteful number, since it uses less digits than its factorization.

189617440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185124 (or 1185116 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 189617440 is about 13770.1648501389. The cubic root of 189617440 is about 574.5036068776.

The spelling of 189617440 in words is "one hundred eighty-nine million, six hundred seventeen thousand, four hundred forty".