1685379973 has 4 divisors (see below), whose sum is σ = 1685497600. Its totient is φ = 1685262348.

The previous prime is 1685379953. The next prime is 1685380033. The reversal of 1685379973 is 3799735861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3799735861 = 23 ⋅165205907.

It is a cyclic number.

It is not a de Polignac number, because 1685379973 - 2¹³ = 1685371781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685379953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33765 + ... + 67162.

It is an arithmetic number, because the mean of its divisors is an integer number (421374400).

Almost surely, 2^1685379973 is an apocalyptic number.

It is an amenable number.

1685379973 is a deficient number, since it is larger than the sum of its proper divisors (117627).

1685379973 is a wasteful number, since it uses less digits than its factorization.

1685379973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117626.

The product of its digits is 8573040, while the sum is 58.

The square root of 1685379973 is about 41053.3795563776. The cubic root of 1685379973 is about 1190.0520121795.

The spelling of 1685379973 in words is "one billion, six hundred eighty-five million, three hundred seventy-nine thousand, nine hundred seventy-three".