1645272 has 40 divisors (see below), whose sum is σ = 4610100. Its totient is φ = 548208.

The previous prime is 1645253. The next prime is 1645291. The reversal of 1645272 is 2725461.

It is an interprime number because it is at equal distance from previous prime (1645253) and next prime (1645291).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 622 + ... + 1917.

2^1645272 is an apocalyptic number.

1645272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1645272 is an abundant number, since it is smaller than the sum of its proper divisors (2964828).

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

1645272 is a wasteful number, since it uses less digits than its factorization.

1645272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557 (or 2544 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 1645272 is about 1282.6815660950. The cubic root of 1645272 is about 118.0536000865.

The spelling of 1645272 in words is "one million, six hundred forty-five thousand, two hundred seventy-two".