1645480 has 32 divisors (see below), whose sum is σ = 3824640. Its totient is φ = 636480.

The previous prime is 1645477. The next prime is 1645487. The reversal of 1645480 is 845461.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645487) 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, 577 + ... + 1903.

It is an arithmetic number, because the mean of its divisors is an integer number (119520).

2^1645480 is an apocalyptic number.

1645480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1912320).

1645480 is an abundant number, since it is smaller than the sum of its proper divisors (2179160).

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

1645480 is a wasteful number, since it uses less digits than its factorization.

1645480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369 (or 1365 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1645480 is about 1282.7626436719. The cubic root of 1645480 is about 118.0585747684.

The spelling of 1645480 in words is "one million, six hundred forty-five thousand, four hundred eighty".