1801961 has 8 divisors (see below), whose sum is σ = 2075520. Its totient is φ = 1532448.

The previous prime is 1801931. The next prime is 1801967. The reversal of 1801961 is 1691081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1801961 - 2⁶ = 1801897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1801961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20 + ... + 1898.

It is an arithmetic number, because the mean of its divisors is an integer number (259440).

2^1801961 is an apocalyptic number.

It is an amenable number.

1801961 is a deficient number, since it is larger than the sum of its proper divisors (273559).

1801961 is a wasteful number, since it uses less digits than its factorization.

1801961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1801961 is about 1342.3714091115. The cubic root of 1801961 is about 121.6881986870.

The spelling of 1801961 in words is "one million, eight hundred one thousand, nine hundred sixty-one".