3646820 has 12 divisors (see below), whose sum is σ = 7658364. Its totient is φ = 1458720.

The previous prime is 3646817. The next prime is 3646829. The reversal of 3646820 is 286463.

It can be written as a sum of positive squares in 2 ways, for example, as 605284 + 3041536 = 778^2 + 1744^2 .

It is a super-2 number, since 2×3646820² = 26598592224800, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3646829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91151 + ... + 91190.

It is an arithmetic number, because the mean of its divisors is an integer number (638197).

Almost surely, 2^3646820 is an apocalyptic number.

It is an amenable number.

3646820 is an abundant number, since it is smaller than the sum of its proper divisors (4011544).

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

3646820 is a wasteful number, since it uses less digits than its factorization.

3646820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182350 (or 182348 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 3646820 is about 1909.6648920688. The cubic root of 3646820 is about 153.9234453934.

The spelling of 3646820 in words is "three million, six hundred forty-six thousand, eight hundred twenty".