1999227643 has 8 divisors (see below), whose sum is σ = 2384172288. Its totient is φ = 1639118184.

The previous prime is 1999227613. The next prime is 1999227647. The reversal of 1999227643 is 3467229991.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-1999227643 is a prime.

It is a super-2 number, since 2×1999227643² = 7993822337070670898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999227647) 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, 6208621 + ... + 6208942.

It is an arithmetic number, because the mean of its divisors is an integer number (298021536).

Almost surely, 2^1999227643 is an apocalyptic number.

1999227643 is a deficient number, since it is larger than the sum of its proper divisors (384944645).

1999227643 is a wasteful number, since it uses less digits than its factorization.

1999227643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12417593.

The product of its digits is 1469664, while the sum is 52.

The square root of 1999227643 is about 44712.7235023768. The cubic root of 1999227643 is about 1259.7588442059.

The spelling of 1999227643 in words is "one billion, nine hundred ninety-nine million, two hundred twenty-seven thousand, six hundred forty-three".