1820016985 has 8 divisors (see below), whose sum is σ = 2203348680. Its totient is φ = 1443128064.

The previous prime is 1820016959. The next prime is 1820017007. The reversal of 1820016985 is 5896100281.

It can be written as a sum of positive squares in 4 ways, for example, as 4575321 + 1815441664 = 2139^2 + 42608^2 .

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 1820016985 - 2⁷ = 1820016857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1610070 + ... + 1611199.

It is an arithmetic number, because the mean of its divisors is an integer number (275418585).

Almost surely, 2^1820016985 is an apocalyptic number.

It is an amenable number.

1820016985 is a deficient number, since it is larger than the sum of its proper divisors (383331695).

1820016985 is a wasteful number, since it uses less digits than its factorization.

1820016985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221387.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 1820016985 is about 42661.6570822091. The cubic root of 1820016985 is about 1220.9329478085.

The spelling of 1820016985 in words is "one billion, eight hundred twenty million, sixteen thousand, nine hundred eighty-five".