1999894537 has 4 divisors (see below), whose sum is σ = 2064407296. Its totient is φ = 1935381780.

The previous prime is 1999894517. The next prime is 1999894541. The reversal of 1999894537 is 7354989991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1999894537 - 2¹⁵ = 1999861769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999894517) 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 3 ways as a sum of consecutive naturals, for example, 32256333 + ... + 32256394.

It is an arithmetic number, because the mean of its divisors is an integer number (516101824).

Almost surely, 2^1999894537 is an apocalyptic number.

It is an amenable number.

1999894537 is a deficient number, since it is larger than the sum of its proper divisors (64512759).

1999894537 is an equidigital number, since it uses as much as digits as its factorization.

1999894537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64512758.

The product of its digits is 22044960, while the sum is 64.

The square root of 1999894537 is about 44720.1804222657. The cubic root of 1999894537 is about 1259.8989036633.

The spelling of 1999894537 in words is "one billion, nine hundred ninety-nine million, eight hundred ninety-four thousand, five hundred thirty-seven".