1866247361 has 8 divisors (see below), whose sum is σ = 2047676544. Its totient is φ = 1686779920.

The previous prime is 1866247321. The next prime is 1866247363. The reversal of 1866247361 is 1637426681.

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 1866247361 - 2¹⁰ = 1866246337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1866247363) 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 7 ways as a sum of consecutive naturals, for example, 488441 + ... + 492246.

It is an arithmetic number, because the mean of its divisors is an integer number (255959568).

Almost surely, 2^1866247361 is an apocalyptic number.

1866247361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1866247361 is a deficient number, since it is larger than the sum of its proper divisors (181429183).

1866247361 is a wasteful number, since it uses less digits than its factorization.

1866247361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980871.

The product of its digits is 290304, while the sum is 44.

The square root of 1866247361 is about 43200.0851966752. The cubic root of 1866247361 is about 1231.1843003207.

The spelling of 1866247361 in words is "one billion, eight hundred sixty-six million, two hundred forty-seven thousand, three hundred sixty-one".