1997492667 has 8 divisors (see below), whose sum is σ = 2803498560. Its totient is φ = 1261574280.

The previous prime is 1997492647. The next prime is 1997492671. The reversal of 1997492667 is 7662947991.

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

It is not a de Polignac number, because 1997492667 - 2¹⁵ = 1997459899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1997492667.

It is not an unprimeable number, because it can be changed into a prime (1997492647) 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, 17521809 + ... + 17521922.

It is an arithmetic number, because the mean of its divisors is an integer number (350437320).

Almost surely, 2^1997492667 is an apocalyptic number.

1997492667 is a deficient number, since it is larger than the sum of its proper divisors (806005893).

1997492667 is a wasteful number, since it uses less digits than its factorization.

1997492667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35043753.

The product of its digits is 10287648, while the sum is 60.

The square root of 1997492667 is about 44693.3179233764. The cubic root of 1997492667 is about 1259.3943227825.

The spelling of 1997492667 in words is "one billion, nine hundred ninety-seven million, four hundred ninety-two thousand, six hundred sixty-seven".