1646634 has 32 divisors (see below), whose sum is σ = 3660480. Its totient is φ = 489600.

The previous prime is 1646633. The next prime is 1646641. The reversal of 1646634 is 4366461.

It is a super-2 number, since 2×1646634² = 5422807059912, which contains 22 as substring.

It is a d-powerful number, because it can be written as 1 + 6 + 4⁴ + 6⁴ + 6⁶ + 3¹³ + 4⁶ .

It is not an unprimeable number, because it can be changed into a prime (1646633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3822 + ... + 4230.

It is an arithmetic number, because the mean of its divisors is an integer number (114390).

2^1646634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1830240).

1646634 is an abundant number, since it is smaller than the sum of its proper divisors (2013846).

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

1646634 is a wasteful number, since it uses less digits than its factorization.

1646634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486.

The product of its digits is 10368, while the sum is 30.

The square root of 1646634 is about 1283.2123752520. The cubic root of 1646634 is about 118.0861670735.

The spelling of 1646634 in words is "one million, six hundred forty-six thousand, six hundred thirty-four".