1321806630 has 32 divisors (see below), whose sum is σ = 3339302400. Its totient is φ = 333929952.

The previous prime is 1321806599. The next prime is 1321806641. The reversal of 1321806630 is 366081231.

It is a super-2 number, since 2×1321806630² = 3494345534223913800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1158910 + ... + 1160049.

It is an arithmetic number, because the mean of its divisors is an integer number (104353200).

Almost surely, 2^1321806630 is an apocalyptic number.

1321806630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321806630 is an abundant number, since it is smaller than the sum of its proper divisors (2017495770).

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

1321806630 is a wasteful number, since it uses less digits than its factorization.

1321806630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318988.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1321806630 is about 36356.6586748562. The cubic root of 1321806630 is about 1097.4615376990.

Adding to 1321806630 its reverse (366081231), we get a palindrome (1687887861).

The spelling of 1321806630 in words is "one billion, three hundred twenty-one million, eight hundred six thousand, six hundred thirty".