1969638487 has 4 divisors (see below), whose sum is σ = 1970173240. Its totient is φ = 1969103736.

The previous prime is 1969638457. The next prime is 1969638529. The reversal of 1969638487 is 7848369691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1969638487 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 (1969638457) 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, 261813 + ... + 269230.

It is an arithmetic number, because the mean of its divisors is an integer number (492543310).

Almost surely, 2^1969638487 is an apocalyptic number.

1969638487 is a deficient number, since it is larger than the sum of its proper divisors (534753).

1969638487 is an equidigital number, since it uses as much as digits as its factorization.

1969638487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534752.

The product of its digits is 15676416, while the sum is 61.

The square root of 1969638487 is about 44380.6093581420. The cubic root of 1969638487 is about 1253.5129950702.

The spelling of 1969638487 in words is "one billion, nine hundred sixty-nine million, six hundred thirty-eight thousand, four hundred eighty-seven".