1662740 has 12 divisors (see below), whose sum is σ = 3491796. Its totient is φ = 665088.

The previous prime is 1662737. The next prime is 1662751. The reversal of 1662740 is 472661.

1662740 = 53² + 54² + ... + 172².

It can be written as a sum of positive squares in 2 ways, for example, as 232324 + 1430416 = 482^2 + 1196^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 41549 + ... + 41588.

It is an arithmetic number, because the mean of its divisors is an integer number (290983).

2^1662740 is an apocalyptic number.

1662740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662740 is an abundant number, since it is smaller than the sum of its proper divisors (1829056).

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

1662740 is a wasteful number, since it uses less digits than its factorization.

1662740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83146 (or 83144 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1662740 is about 1289.4727604723. The cubic root of 1662740 is about 118.4699253677.

The spelling of 1662740 in words is "one million, six hundred sixty-two thousand, seven hundred forty".