1631320 has 32 divisors (see below), whose sum is σ = 3888000. Its totient is φ = 613888.

The previous prime is 1631309. The next prime is 1631341. The reversal of 1631320 is 231361.

It is a super-2 number, since 2×1631320² = 5322409884800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1631294 and 1631303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (121500).

2^1631320 is an apocalyptic number.

1631320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1631320 is an abundant number, since it is smaller than the sum of its proper divisors (2256680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1631320 is a wasteful number, since it uses less digits than its factorization.

1631320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427 (or 2423 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1631320 is about 1277.2313807607. The cubic root of 1631320 is about 117.7189519401.

Adding to 1631320 its reverse (231361), we get a palindrome (1862681).

The spelling of 1631320 in words is "one million, six hundred thirty-one thousand, three hundred twenty".