1646864 has 10 divisors (see below), whose sum is σ = 3190830. Its totient is φ = 823424.

The previous prime is 1646861. The next prime is 1646893. The reversal of 1646864 is 4686461.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 8464 = 1280^2 + 92^2 .

It is a super-2 number, since 2×1646864² = 5424322068992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1646861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51449 + ... + 51480.

It is an arithmetic number, because the mean of its divisors is an integer number (319083).

2^1646864 is an apocalyptic number.

It is an amenable number.

1646864 is a deficient number, since it is larger than the sum of its proper divisors (1543966).

1646864 is a wasteful number, since it uses less digits than its factorization.

1646864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102937 (or 102931 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 1646864 is about 1283.3019909593. The cubic root of 1646864 is about 118.0916648655.

The spelling of 1646864 in words is "one million, six hundred forty-six thousand, eight hundred sixty-four".