1536993985 has 4 divisors (see below), whose sum is σ = 1844392788. Its totient is φ = 1229595184.

The previous prime is 1536993977. The next prime is 1536994009. The reversal of 1536993985 is 5893996351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 907937424 + 629056561 = 30132^2 + 25081^2 .

It is a cyclic number.

It is not a de Polignac number, because 1536993985 - 2³ = 1536993977 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153699394 + ... + 153699403.

It is an arithmetic number, because the mean of its divisors is an integer number (461098197).

Almost surely, 2^1536993985 is an apocalyptic number.

It is an amenable number.

1536993985 is a deficient number, since it is larger than the sum of its proper divisors (307398803).

1536993985 is an equidigital number, since it uses as much as digits as its factorization.

1536993985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307398802.

The product of its digits is 7873200, while the sum is 58.

The square root of 1536993985 is about 39204.5148547970. The cubic root of 1536993985 is about 1154.0484870300.

The spelling of 1536993985 in words is "one billion, five hundred thirty-six million, nine hundred ninety-three thousand, nine hundred eighty-five".