1687438514 has 4 divisors (see below), whose sum is σ = 2531157774. Its totient is φ = 843719256.

The previous prime is 1687438463. The next prime is 1687438561. The reversal of 1687438514 is 4158347861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4158347861 = 101 ⋅41171761.

It can be written as a sum of positive squares in only one way, i.e., 1446661225 + 240777289 = 38035^2 + 15517^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421859627 + ... + 421859630.

Almost surely, 2^1687438514 is an apocalyptic number.

1687438514 is a deficient number, since it is larger than the sum of its proper divisors (843719260).

1687438514 is an equidigital number, since it uses as much as digits as its factorization.

1687438514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843719259.

The product of its digits is 645120, while the sum is 47.

The square root of 1687438514 is about 41078.4434223109. The cubic root of 1687438514 is about 1190.5363291056.

The spelling of 1687438514 in words is "one billion, six hundred eighty-seven million, four hundred thirty-eight thousand, five hundred fourteen".