1685378071 has 16 divisors (see below), whose sum is σ = 1919030400. Its totient is φ = 1467311328.

The previous prime is 1685378063. The next prime is 1685378159. The reversal of 1685378071 is 1708735861.

It is not a de Polignac number, because 1685378071 - 2³ = 1685378063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685378171) 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, 41040 + ... + 71098.

It is an arithmetic number, because the mean of its divisors is an integer number (119939400).

Almost surely, 2^1685378071 is an apocalyptic number.

1685378071 is a deficient number, since it is larger than the sum of its proper divisors (233652329).

1685378071 is a wasteful number, since it uses less digits than its factorization.

1685378071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30318.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 1685378071 is about 41053.3563914085. The cubic root of 1685378071 is about 1190.0515645099.

It can be divided in two parts, 1685 and 378071, that added together give a triangular number (379756 = T₈₇₁).

The spelling of 1685378071 in words is "one billion, six hundred eighty-five million, three hundred seventy-eight thousand, seventy-one".