1630440 has 96 divisors (see below), whose sum is σ = 6065280. Its totient is φ = 372096.

The previous prime is 1630429. The next prime is 1630441. The reversal of 1630440 is 440361.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1630441) 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, 2197 + ... + 2843.

It is an arithmetic number, because the mean of its divisors is an integer number (63180).

2^1630440 is an apocalyptic number.

1630440 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 1630440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3032640).

1630440 is an abundant number, since it is smaller than the sum of its proper divisors (4434840).

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

1630440 is a wasteful number, since it uses less digits than its factorization.

1630440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1630440 is about 1276.8868391522. The cubic root of 1630440 is about 117.6977806779.

The spelling of 1630440 in words is "one million, six hundred thirty thousand, four hundred forty".