1890961 has 8 divisors (see below), whose sum is σ = 2051784. Its totient is φ = 1735680.

The previous prime is 1890953. The next prime is 1890997. The reversal of 1890961 is 1690981.

It can be written as a sum of positive squares in 4 ways, for example, as 591361 + 1299600 = 769^2 + 1140^2 .

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 1890961 - 2³ = 1890953 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1890901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660 + ... + 2053.

It is an arithmetic number, because the mean of its divisors is an integer number (256473).

2^1890961 is an apocalyptic number.

It is an amenable number.

1890961 is a deficient number, since it is larger than the sum of its proper divisors (160823).

1890961 is a wasteful number, since it uses less digits than its factorization.

1890961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1890961 is about 1375.1221763902. The cubic root of 1890961 is about 123.6595107619.

The spelling of 1890961 in words is "one million, eight hundred ninety thousand, nine hundred sixty-one".