1997142649 has 8 divisors (see below), whose sum is σ = 2103902240. Its totient is φ = 1890547776.

The previous prime is 1997142619. The next prime is 1997142713. The reversal of 1997142649 is 9462417991.

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

It is a cyclic number.

It is not a de Polignac number, because 1997142649 - 2⁵ = 1997142617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997142596 and 1997142605.

It is not an unprimeable number, because it can be changed into a prime (1997142619) 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 7 ways as a sum of consecutive naturals, for example, 15879 + ... + 65164.

It is an arithmetic number, because the mean of its divisors is an integer number (262987780).

Almost surely, 2^1997142649 is an apocalyptic number.

1997142649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1997142649 is a deficient number, since it is larger than the sum of its proper divisors (106759591).

1997142649 is a wasteful number, since it uses less digits than its factorization.

1997142649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82359.

The product of its digits is 979776, while the sum is 52.

The square root of 1997142649 is about 44689.4019763075. The cubic root of 1997142649 is about 1259.3207578179.

The spelling of 1997142649 in words is "one billion, nine hundred ninety-seven million, one hundred forty-two thousand, six hundred forty-nine".