1868142609 has 20 divisors (see below), whose sum is σ = 2792416704. Its totient is φ = 1244654424.

The previous prime is 1868142559. The next prime is 1868142613. The reversal of 1868142609 is 9062418681.

It is a de Polignac number, because none of the positive numbers 2^k-1868142609 is a prime.

It is a super-2 number, since 2×1868142609² = 6979913615122653762, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1868142649) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 143364 + ... + 155850.

Almost surely, 2^1868142609 is an apocalyptic number.

It is an amenable number.

1868142609 is a deficient number, since it is larger than the sum of its proper divisors (924274095).

1868142609 is a wasteful number, since it uses less digits than its factorization.

1868142609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14346 (or 14337 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1868142609 is about 43222.0153278396. The cubic root of 1868142609 is about 1231.6009314331.

The spelling of 1868142609 in words is "one billion, eight hundred sixty-eight million, one hundred forty-two thousand, six hundred nine".