1685994427 has 16 divisors (see below), whose sum is σ = 1876295680. Its totient is φ = 1504461600.

The previous prime is 1685994421. The next prime is 1685994437. The reversal of 1685994427 is 7244995861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685994427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685994421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 513802 + ... + 517072.

It is an arithmetic number, because the mean of its divisors is an integer number (117268480).

Almost surely, 2^1685994427 is an apocalyptic number.

1685994427 is the 23707-th hex number.

1685994427 is a deficient number, since it is larger than the sum of its proper divisors (190301253).

1685994427 is a wasteful number, since it uses less digits than its factorization.

1685994427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594.

The product of its digits is 4354560, while the sum is 55.

The square root of 1685994427 is about 41060.8624726759. The cubic root of 1685994427 is about 1190.1966172309.

The spelling of 1685994427 in words is "one billion, six hundred eighty-five million, nine hundred ninety-four thousand, four hundred twenty-seven".