1861355 has 4 divisors (see below), whose sum is σ = 2233632. Its totient is φ = 1489080.

The previous prime is 1861351. The next prime is 1861397. The reversal of 1861355 is 5531681.

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

It is not a de Polignac number, because 1861355 - 2² = 1861351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186131 + ... + 186140.

It is an arithmetic number, because the mean of its divisors is an integer number (558408).

2^1861355 is an apocalyptic number.

1861355 is a deficient number, since it is larger than the sum of its proper divisors (372277).

1861355 is an equidigital number, since it uses as much as digits as its factorization.

1861355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372276.

The product of its digits is 3600, while the sum is 29.

The square root of 1861355 is about 1364.3148463606. The cubic root of 1861355 is about 123.0107510377.

The spelling of 1861355 in words is "one million, eight hundred sixty-one thousand, three hundred fifty-five".