1321630 has 16 divisors (see below), whose sum is σ = 2397600. Its totient is φ = 524512.

The previous prime is 1321627. The next prime is 1321633. The reversal of 1321630 is 361231.

It is an interprime number because it is at equal distance from previous prime (1321627) and next prime (1321633).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1047 + ... + 1933.

It is an arithmetic number, because the mean of its divisors is an integer number (149850).

2^1321630 is an apocalyptic number.

1321630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321630 is a deficient number, since it is larger than the sum of its proper divisors (1075970).

1321630 is a wasteful number, since it uses less digits than its factorization.

1321630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043.

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

The square root of 1321630 is about 1149.6216769007. The cubic root of 1321630 is about 109.7412651762.

Adding to 1321630 its reverse (361231), we get a palindrome (1682861).

The spelling of 1321630 in words is "one million, three hundred twenty-one thousand, six hundred thirty".