1487391985 has 4 divisors (see below), whose sum is σ = 1784870388. Its totient is φ = 1189913584.

The previous prime is 1487391979. The next prime is 1487392019. The reversal of 1487391985 is 5891937841.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 347114161 + 1140277824 = 18631^2 + 33768^2 .

It is a cyclic number.

It is not a de Polignac number, because 1487391985 - 2³ = 1487391977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 148739194 + ... + 148739203.

It is an arithmetic number, because the mean of its divisors is an integer number (446217597).

Almost surely, 2^1487391985 is an apocalyptic number.

It is an amenable number.

1487391985 is a deficient number, since it is larger than the sum of its proper divisors (297478403).

1487391985 is an equidigital number, since it uses as much as digits as its factorization.

1487391985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297478402.

The product of its digits is 2177280, while the sum is 55.

The square root of 1487391985 is about 38566.7212114279. The cubic root of 1487391985 is about 1141.4979756322.

The spelling of 1487391985 in words is "one billion, four hundred eighty-seven million, three hundred ninety-one thousand, nine hundred eighty-five".