1645630 has 16 divisors (see below), whose sum is σ = 3385440. Its totient is φ = 564192.

The previous prime is 1645613. The next prime is 1645643. The reversal of 1645630 is 365461.

It is a junction number, because it is equal to n+sod(n) for n = 1645595 and 1645604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11685 + ... + 11824.

It is an arithmetic number, because the mean of its divisors is an integer number (211590).

2^1645630 is an apocalyptic number.

1645630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645630 is an abundant number, since it is smaller than the sum of its proper divisors (1739810).

1645630 is a wasteful number, since it uses less digits than its factorization.

1645630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23523.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1645630 is about 1282.8211098980. The cubic root of 1645630 is about 118.0621620191.

The spelling of 1645630 in words is "one million, six hundred forty-five thousand, six hundred thirty".