1961808 has 40 divisors (see below), whose sum is σ = 5291328. Its totient is φ = 625152.

The previous prime is 1961797. The next prime is 1961819. The reversal of 1961808 is 8081691.

It is an interprime number because it is at equal distance from previous prime (1961797) and next prime (1961819).

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 7 ways as a sum of consecutive naturals, for example, 216 + ... + 1992.

2^1961808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1961808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2645664).

1961808 is an abundant number, since it is smaller than the sum of its proper divisors (3329520).

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

1961808 is a wasteful number, since it uses less digits than its factorization.

1961808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811 (or 1805 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1961808 is about 1400.6455654447. The cubic root of 1961808 is about 125.1849635063.

The spelling of 1961808 in words is "one million, nine hundred sixty-one thousand, eight hundred eight".