1648440 has 96 divisors (see below), whose sum is σ = 5662800. Its totient is φ = 414720.

The previous prime is 1648429. The next prime is 1648441. The reversal of 1648440 is 448461.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1648441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6720 + ... + 6960.

2^1648440 is an apocalyptic number.

1648440 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 1648440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2831400).

1648440 is an abundant number, since it is smaller than the sum of its proper divisors (4014360).

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

1648440 is a wasteful number, since it uses less digits than its factorization.

1648440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 1648440 is about 1283.9158850953. The cubic root of 1648440 is about 118.1293229291.

The spelling of 1648440 in words is "one million, six hundred forty-eight thousand, four hundred forty".