1641906 has 48 divisors (see below), whose sum is σ = 4140864. Its totient is φ = 460512.

The previous prime is 1641889. The next prime is 1641907. The reversal of 1641906 is 6091461.

It is a self number, because there is not a number n which added to its sum of digits gives 1641906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10380 + ... + 10536.

It is an arithmetic number, because the mean of its divisors is an integer number (86268).

2^1641906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2070432).

1641906 is an abundant number, since it is smaller than the sum of its proper divisors (2498958).

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

1641906 is a wasteful number, since it uses less digits than its factorization.

1641906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1641906 is about 1281.3687993704. The cubic root of 1641906 is about 117.9730379843.

The spelling of 1641906 in words is "one million, six hundred forty-one thousand, nine hundred six".