1687034893 has 4 divisors (see below), whose sum is σ = 1745208540. Its totient is φ = 1628861248.

The previous prime is 1687034887. The next prime is 1687034903. The reversal of 1687034893 is 3984307861.

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 1047299044 + 639735849 = 32362^2 + 25293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687034893 - 2⁵ = 1687034861 is a prime.

It is a super-4 number, since 4×1687034893⁴ (a number of 38 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687034863) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 29086780 + ... + 29086837.

It is an arithmetic number, because the mean of its divisors is an integer number (436302135).

Almost surely, 2^1687034893 is an apocalyptic number.

It is an amenable number.

1687034893 is a deficient number, since it is larger than the sum of its proper divisors (58173647).

1687034893 is an equidigital number, since it uses as much as digits as its factorization.

1687034893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58173646.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 1687034893 is about 41073.5303206335. The cubic root of 1687034893 is about 1190.4413994677.

The spelling of 1687034893 in words is "one billion, six hundred eighty-seven million, thirty-four thousand, eight hundred ninety-three".