1645212 has 24 divisors (see below), whose sum is σ = 3894912. Its totient is φ = 540400.

The previous prime is 1645211. The next prime is 1645249. The reversal of 1645212 is 2125461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645211) 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, 114 + ... + 1817.

It is an arithmetic number, because the mean of its divisors is an integer number (162288).

2^1645212 is an apocalyptic number.

1645212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1645212 is an abundant number, since it is smaller than the sum of its proper divisors (2249700).

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

1645212 is a wasteful number, since it uses less digits than its factorization.

1645212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009 (or 2007 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 1645212 is about 1282.6581773801. The cubic root of 1645212 is about 118.0521650043.

Subtracting 1645212 from its reverse (2125461), we obtain a square (480249 = 693²).

The spelling of 1645212 in words is "one million, six hundred forty-five thousand, two hundred twelve".