1626440 has 32 divisors (see below), whose sum is σ = 3716280. Its totient is φ = 640512.

The previous prime is 1626437. The next prime is 1626451. The reversal of 1626440 is 446261.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 996004 + 630436 = 998^2 + 794^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2642 + ... + 3198.

2^1626440 is an apocalyptic number.

1626440 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 1626440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858140).

1626440 is an abundant number, since it is smaller than the sum of its proper divisors (2089840).

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

1626440 is a wasteful number, since it uses less digits than its factorization.

1626440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1626440 is about 1275.3195677947. The cubic root of 1626440 is about 117.6014515378.

The spelling of 1626440 in words is "one million, six hundred twenty-six thousand, four hundred forty".