189934840 has 16 divisors (see below), whose sum is σ = 427353480. Its totient is φ = 75973920.

The previous prime is 189934819. The next prime is 189934841. The reversal of 189934840 is 48439981.

189934840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189934841) 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, 2374146 + ... + 2374225.

Almost surely, 2^189934840 is an apocalyptic number.

189934840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189934840 is an abundant number, since it is smaller than the sum of its proper divisors (237418640).

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

189934840 is a wasteful number, since it uses less digits than its factorization.

189934840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748382 (or 4748378 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 189934840 is about 13781.6849477849. The cubic root of 189934840 is about 574.8239814095.

The spelling of 189934840 in words is "one hundred eighty-nine million, nine hundred thirty-four thousand, eight hundred forty".