1631228 has 6 divisors (see below), whose sum is σ = 2854656. Its totient is φ = 815612.

The previous prime is 1631209. The next prime is 1631243. The reversal of 1631228 is 8221361.

It is a zygodrome in base 2.

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 as a sum of consecutive naturals, namely, 203900 + ... + 203907.

It is an arithmetic number, because the mean of its divisors is an integer number (475776).

2^1631228 is an apocalyptic number.

It is an amenable number.

1631228 is a deficient number, since it is larger than the sum of its proper divisors (1223428).

1631228 is a wasteful number, since it uses less digits than its factorization.

1631228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407811 (or 407809 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 1631228 is about 1277.1953648522. The cubic root of 1631228 is about 117.7167389373.

Adding to 1631228 its reverse (8221361), we get a palindrome (9852589).

The spelling of 1631228 in words is "one million, six hundred thirty-one thousand, two hundred twenty-eight".