1671543642 has 8 divisors (see below), whose sum is σ = 3343087296. Its totient is φ = 557181212.

The previous prime is 1671543641. The next prime is 1671543659. The reversal of 1671543642 is 2463451761.

It is a happy number.

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

1671543642 is an admirable number.

It is a super-2 number, since 2×1671543642² = 5588116294221248328, 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 1671543642.

It is not an unprimeable number, because it can be changed into a prime (1671543641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139295298 + ... + 139295309.

It is an arithmetic number, because the mean of its divisors is an integer number (417885912).

Almost surely, 2^1671543642 is an apocalyptic number.

1671543642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1671543642 is a wasteful number, since it uses less digits than its factorization.

1671543642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278590612.

The product of its digits is 120960, while the sum is 39.

The square root of 1671543642 is about 40884.5159198443. The cubic root of 1671543642 is about 1186.7864340500.

The spelling of 1671543642 in words is "one billion, six hundred seventy-one million, five hundred forty-three thousand, six hundred forty-two".