1868538505 has 8 divisors (see below), whose sum is σ = 2242555272. Its totient is φ = 1494624768.

The previous prime is 1868538473. The next prime is 1868538509. The reversal of 1868538505 is 5058358681.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 915849 + 1867622656 = 957^2 + 43216^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1868538505 - 2⁵ = 1868538473 is a prime.

It is a super-2 number, since 2×1868538505² = 6982872289335270050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1868538509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22299 + ... + 65071.

It is an arithmetic number, because the mean of its divisors is an integer number (280319409).

Almost surely, 2^1868538505 is an apocalyptic number.

It is an amenable number.

1868538505 is a deficient number, since it is larger than the sum of its proper divisors (374016767).

1868538505 is an equidigital number, since it uses as much as digits as its factorization.

1868538505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51515.

The product of its (nonzero) digits is 1152000, while the sum is 49.

The square root of 1868538505 is about 43226.5948809295. The cubic root of 1868538505 is about 1231.6879254061.

The spelling of 1868538505 in words is "one billion, eight hundred sixty-eight million, five hundred thirty-eight thousand, five hundred five".