1631646 has 12 divisors (see below), whose sum is σ = 3535272. Its totient is φ = 543876.

The previous prime is 1631639. The next prime is 1631647. The reversal of 1631646 is 6461361.

1631646 is a `hidden beast` number, since 16 + 3 + 1 + 646 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45306 + ... + 45341.

It is an arithmetic number, because the mean of its divisors is an integer number (294606).

2^1631646 is an apocalyptic number.

1631646 is an abundant number, since it is smaller than the sum of its proper divisors (1903626).

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

1631646 is a wasteful number, since it uses less digits than its factorization.

1631646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90655 (or 90652 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1631646 is about 1277.3589941751. The cubic root of 1631646 is about 117.7267929977.

The spelling of 1631646 in words is "one million, six hundred thirty-one thousand, six hundred forty-six".