1997634449 has 4 divisors (see below), whose sum is σ = 2031492720. Its totient is φ = 1963776180.

The previous prime is 1997634439. The next prime is 1997634473. The reversal of 1997634449 is 9444367991.

It is a happy number.

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 1997634449 - 2¹² = 1997630353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1997634394 and 1997634403.

It is not an unprimeable number, because it can be changed into a prime (1997634409) 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, 16929047 + ... + 16929164.

It is an arithmetic number, because the mean of its divisors is an integer number (507873180).

Almost surely, 2^1997634449 is an apocalyptic number.

It is an amenable number.

1997634449 is a deficient number, since it is larger than the sum of its proper divisors (33858271).

1997634449 is an equidigital number, since it uses as much as digits as its factorization.

1997634449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33858270.

The product of its digits is 5878656, while the sum is 56.

The square root of 1997634449 is about 44694.9040607540. The cubic root of 1997634449 is about 1259.4241193410.

The spelling of 1997634449 in words is "one billion, nine hundred ninety-seven million, six hundred thirty-four thousand, four hundred forty-nine".