840189489 has 8 divisors (see below), whose sum is σ = 1124418240. Its totient is φ = 558043536.

The previous prime is 840189463. The next prime is 840189491. The reversal of 840189489 is 984981048.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 840189489 - 2¹² = 840185393 is a prime.

It is a super-2 number, since 2×840189489² = 1411836754852162242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (840189439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519757 + ... + 521370.

It is an arithmetic number, because the mean of its divisors is an integer number (140552280).

Almost surely, 2^840189489 is an apocalyptic number.

It is an amenable number.

840189489 is a deficient number, since it is larger than the sum of its proper divisors (284228751).

840189489 is a wasteful number, since it uses less digits than its factorization.

840189489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041399.

The product of its (nonzero) digits is 663552, while the sum is 51.

The square root of 840189489 is about 28986.0223038623. The cubic root of 840189489 is about 943.6097392302.

The spelling of 840189489 in words is "eight hundred forty million, one hundred eighty-nine thousand, four hundred eighty-nine".