1855641 has 4 divisors (see below), whose sum is σ = 2474192. Its totient is φ = 1237092.

The previous prime is 1855627. The next prime is 1855649. The reversal of 1855641 is 1465581.

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 not a de Polignac number, because 1855641 - 2⁶ = 1855577 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1855599 and 1855608.

It is not an unprimeable number, because it can be changed into a prime (1855649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309271 + ... + 309276.

It is an arithmetic number, because the mean of its divisors is an integer number (618548).

2^1855641 is an apocalyptic number.

It is an amenable number.

1855641 is a deficient number, since it is larger than the sum of its proper divisors (618551).

1855641 is an equidigital number, since it uses as much as digits as its factorization.

1855641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618550.

The product of its digits is 4800, while the sum is 30.

The square root of 1855641 is about 1362.2191453654. The cubic root of 1855641 is about 122.8847489408.

The spelling of 1855641 in words is "one million, eight hundred fifty-five thousand, six hundred forty-one".