1906685856 has 144 divisors (see below), whose sum is σ = 5533032960. Its totient is φ = 622702080.

The previous prime is 1906685843. The next prime is 1906685863. The reversal of 1906685856 is 6585866091.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4117881 + ... + 4118343.

It is an arithmetic number, because the mean of its divisors is an integer number (38423840).

Almost surely, 2^1906685856 is an apocalyptic number.

1906685856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1906685856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2766516480).

1906685856 is an abundant number, since it is smaller than the sum of its proper divisors (3626347104).

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

1906685856 is a wasteful number, since it uses less digits than its factorization.

1906685856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The square root of 1906685856 is about 43665.6141145410. The cubic root of 1906685856 is about 1240.0134094977.

The spelling of 1906685856 in words is "one billion, nine hundred six million, six hundred eighty-five thousand, eight hundred fifty-six".