1662540 has 72 divisors (see below), whose sum is σ = 5139120. Its totient is φ = 401280.

The previous prime is 1662527. The next prime is 1662547. The reversal of 1662540 is 452661.

It is a self number, because there is not a number n which added to its sum of digits gives 1662540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7146 + ... + 7374.

2^1662540 is an apocalyptic number.

1662540 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 1662540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2569560).

1662540 is an abundant number, since it is smaller than the sum of its proper divisors (3476580).

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

1662540 is a wasteful number, since it uses less digits than its factorization.

1662540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1662540 is about 1289.3952070641. The cubic root of 1662540 is about 118.4651751892.

The spelling of 1662540 in words is "one million, six hundred sixty-two thousand, five hundred forty".