1855913 has 4 divisors (see below), whose sum is σ = 1919940. Its totient is φ = 1791888.

The previous prime is 1855891. The next prime is 1855921. The reversal of 1855913 is 3195581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1236544 + 619369 = 1112^2 + 787^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855913 - 2⁶ = 1855849 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 1855913.

It is not an unprimeable number, because it can be changed into a prime (1855933) 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, 31970 + ... + 32027.

It is an arithmetic number, because the mean of its divisors is an integer number (479985).

2^1855913 is an apocalyptic number.

It is an amenable number.

1855913 is a deficient number, since it is larger than the sum of its proper divisors (64027).

1855913 is an equidigital number, since it uses as much as digits as its factorization.

1855913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64026.

The product of its digits is 5400, while the sum is 32.

The square root of 1855913 is about 1362.3189788005. The cubic root of 1855913 is about 122.8907527994.

The spelling of 1855913 in words is "one million, eight hundred fifty-five thousand, nine hundred thirteen".