1630855 has 4 divisors (see below), whose sum is σ = 1957032. Its totient is φ = 1304680.

The previous prime is 1630843. The next prime is 1630859. The reversal of 1630855 is 5580361.

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

It is a de Polignac number, because none of the positive numbers 2^k-1630855 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630859) 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, 163081 + ... + 163090.

It is an arithmetic number, because the mean of its divisors is an integer number (489258).

2^1630855 is an apocalyptic number.

1630855 is a deficient number, since it is larger than the sum of its proper divisors (326177).

1630855 is an equidigital number, since it uses as much as digits as its factorization.

1630855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326176.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1630855 is about 1277.0493334245. The cubic root of 1630855 is about 117.7077658016.

It can be divided in two parts, 1630 and 855, that added together give a triangular number (2485 = T₇₀).

The spelling of 1630855 in words is "one million, six hundred thirty thousand, eight hundred fifty-five".