1940561 has 4 divisors (see below), whose sum is σ = 2217792. Its totient is φ = 1663332.

The previous prime is 1940557. The next prime is 1940563. The reversal of 1940561 is 1650491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1940561 - 2² = 1940557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1940561.

It is not an unprimeable number, because it can be changed into a prime (1940563) 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 3 ways as a sum of consecutive naturals, for example, 138605 + ... + 138618.

It is an arithmetic number, because the mean of its divisors is an integer number (554448).

2^1940561 is an apocalyptic number.

It is an amenable number.

1940561 is a deficient number, since it is larger than the sum of its proper divisors (277231).

1940561 is an equidigital number, since it uses as much as digits as its factorization.

1940561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277230.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1940561 is about 1393.0402004250. The cubic root of 1940561 is about 124.7313912080.

The spelling of 1940561 in words is "one million, nine hundred forty thousand, five hundred sixty-one".