1671906 has 8 divisors (see below), whose sum is σ = 3343824. Its totient is φ = 557300.

The previous prime is 1671781. The next prime is 1671907. The reversal of 1671906 is 6091761.

It is a sphenic number, since it is the product of 3 distinct primes.

1671906 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1671907) 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, 139320 + ... + 139331.

It is an arithmetic number, because the mean of its divisors is an integer number (417978).

2^1671906 is an apocalyptic number.

1671906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1671906 is a wasteful number, since it uses less digits than its factorization.

1671906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278656.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1671906 is about 1293.0220415755. The cubic root of 1671906 is about 118.6872185224.

The spelling of 1671906 in words is "one million, six hundred seventy-one thousand, nine hundred six".