1631994 has 64 divisors (see below), whose sum is σ = 4166400. Its totient is φ = 423360.

The previous prime is 1631989. The next prime is 1632013. The reversal of 1631994 is 4991361.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26724 + ... + 26784.

It is an arithmetic number, because the mean of its divisors is an integer number (65100).

2^1631994 is an apocalyptic number.

1631994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1631994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2083200).

1631994 is an abundant number, since it is smaller than the sum of its proper divisors (2534406).

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

1631994 is a wasteful number, since it uses less digits than its factorization.

1631994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 86 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 1631994 is about 1277.4952054705. The cubic root of 1631994 is about 117.7351620540.

The spelling of 1631994 in words is "one million, six hundred thirty-one thousand, nine hundred ninety-four".