1640736 has 72 divisors (see below), whose sum is σ = 4861584. Its totient is φ = 544320.

The previous prime is 1640729. The next prime is 1640741. The reversal of 1640736 is 6370461.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 6.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7671 + ... + 7881.

It is an arithmetic number, because the mean of its divisors is an integer number (67522).

2^1640736 is an apocalyptic number.

1640736 is a gapful number since it is divisible by the number (16) 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 1640736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2430792).

1640736 is an abundant number, since it is smaller than the sum of its proper divisors (3220848).

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

1640736 is an equidigital number, since it uses as much as digits as its factorization.

1640736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 1640736 is about 1280.9121749753. The cubic root of 1640736 is about 117.9450093287.

The spelling of 1640736 in words is "one million, six hundred forty thousand, seven hundred thirty-six".