1999995487 has 4 divisors (see below), whose sum is σ = 2285709136. Its totient is φ = 1714281840.

The previous prime is 1999995479. The next prime is 1999995509. The reversal of 1999995487 is 7845999991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7845999991 = 13259 ⋅591749.

It is a cyclic number.

It is not a de Polignac number, because 1999995487 - 2³ = 1999995479 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 (1999995427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142856814 + ... + 142856827.

It is an arithmetic number, because the mean of its divisors is an integer number (571427284).

Almost surely, 2^1999995487 is an apocalyptic number.

1999995487 is a deficient number, since it is larger than the sum of its proper divisors (285713649).

1999995487 is an equidigital number, since it uses as much as digits as its factorization.

1999995487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285713648.

The product of its digits is 66134880, while the sum is 70.

The square root of 1999995487 is about 44721.3090930934. The cubic root of 1999995487 is about 1259.9201022235.

The spelling of 1999995487 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-five thousand, four hundred eighty-seven".