901855 has 4 divisors (see below), whose sum is σ = 1082232. Its totient is φ = 721480.

The previous prime is 901841. The next prime is 901861. The reversal of 901855 is 558109.

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

It is not a de Polignac number, because 901855 - 2¹¹ = 899807 is a prime.

It is a Duffinian number.

901855 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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, 90181 + ... + 90190.

It is an arithmetic number, because the mean of its divisors is an integer number (270558).

2⁹⁰¹⁸⁵⁵ is an apocalyptic number.

901855 is a deficient number, since it is larger than the sum of its proper divisors (180377).

901855 is a wasteful number, since it uses less digits than its factorization.

901855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180376.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 901855 is about 949.6604656402. The cubic root of 901855 is about 96.6152256363.

The spelling of 901855 in words is "nine hundred one thousand, eight hundred fifty-five".