1999224397 has 4 divisors (see below), whose sum is σ = 2004210396. Its totient is φ = 1994238400.

The previous prime is 1999224391. The next prime is 1999224407. The reversal of 1999224397 is 7934229991.

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 1485794116 + 513430281 = 38546^2 + 22659^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999224397 - 2³ = 1999224389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999224391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2492398 + ... + 2493199.

It is an arithmetic number, because the mean of its divisors is an integer number (501052599).

Almost surely, 2^1999224397 is an apocalyptic number.

It is an amenable number.

1999224397 is a deficient number, since it is larger than the sum of its proper divisors (4985999).

1999224397 is an equidigital number, since it uses as much as digits as its factorization.

1999224397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4985998.

The product of its digits is 2204496, while the sum is 55.

The square root of 1999224397 is about 44712.6872039693. The cubic root of 1999224397 is about 1259.7581624127.

The spelling of 1999224397 in words is "one billion, nine hundred ninety-nine million, two hundred twenty-four thousand, three hundred ninety-seven".