1897855 has 4 divisors (see below), whose sum is σ = 2277432. Its totient is φ = 1518280.

The previous prime is 1897843. The next prime is 1897871. The reversal of 1897855 is 5587981.

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

It is not a de Polignac number, because 1897855 - 2⁵ = 1897823 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189781 + ... + 189790.

It is an arithmetic number, because the mean of its divisors is an integer number (569358).

2^1897855 is an apocalyptic number.

1897855 is a deficient number, since it is larger than the sum of its proper divisors (379577).

1897855 is an equidigital number, since it uses as much as digits as its factorization.

1897855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379576.

The product of its digits is 100800, while the sum is 43.

The square root of 1897855 is about 1377.6265822058. The cubic root of 1897855 is about 123.8096063562.

The spelling of 1897855 in words is "one million, eight hundred ninety-seven thousand, eight hundred fifty-five".