1685106906 has 32 divisors (see below), whose sum is σ = 3916961280. Its totient is φ = 473298096.

The previous prime is 1685106887. The next prime is 1685106953. The reversal of 1685106906 is 6096015861.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337536 + ... + 342491.

It is an arithmetic number, because the mean of its divisors is an integer number (122405040).

Almost surely, 2^1685106906 is an apocalyptic number.

1685106906 is an abundant number, since it is smaller than the sum of its proper divisors (2231854374).

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

1685106906 is a wasteful number, since it uses less digits than its factorization.

1685106906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680098.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1685106906 is about 41050.0536662256. The cubic root of 1685106906 is about 1189.9877375569.

The spelling of 1685106906 in words is "one billion, six hundred eighty-five million, one hundred six thousand, nine hundred six".