1687398534 has 16 divisors (see below), whose sum is σ = 3749774640. Its totient is φ = 562466160.

The previous prime is 1687398523. The next prime is 1687398547. The reversal of 1687398534 is 4358937861.

1687398534 is a `hidden beast` number, since 16 + 8 + 7 + 3 + 98 + 534 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 31248121 = 1687398534 / (1 + 6 + 8 + 7 + 3 + 9 + 8 + 5 + 3 + 4).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15624007 + ... + 15624114.

It is an arithmetic number, because the mean of its divisors is an integer number (234360915).

Almost surely, 2^1687398534 is an apocalyptic number.

1687398534 is an abundant number, since it is smaller than the sum of its proper divisors (2062376106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1687398534 is a wasteful number, since it uses less digits than its factorization.

1687398534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31248132 (or 31248126 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 1687398534 is about 41077.9567894996. The cubic root of 1687398534 is about 1190.5269266853.

The spelling of 1687398534 in words is "one billion, six hundred eighty-seven million, three hundred ninety-eight thousand, five hundred thirty-four".