1321864 has 8 divisors (see below), whose sum is σ = 2478510. Its totient is φ = 660928.

The previous prime is 1321847. The next prime is 1321867. The reversal of 1321864 is 4681231.

It can be written as a sum of positive squares in only one way, i.e., 1119364 + 202500 = 1058^2 + 450^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1321867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82609 + ... + 82624.

2^1321864 is an apocalyptic number.

It is an amenable number.

1321864 is a deficient number, since it is larger than the sum of its proper divisors (1156646).

1321864 is a wasteful number, since it uses less digits than its factorization.

1321864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165239 (or 165235 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 1321864 is about 1149.7234450075. The cubic root of 1321864 is about 109.7477415074.

The spelling of 1321864 in words is "one million, three hundred twenty-one thousand, eight hundred sixty-four".