1640763 has 16 divisors (see below), whose sum is σ = 2469760. Its totient is φ = 1076328.

The previous prime is 1640761. The next prime is 1640773. The reversal of 1640763 is 3670461.

It is not a de Polignac number, because 1640763 - 2¹ = 1640761 is a prime.

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

It is a Duffinian number.

1640763 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1640761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1356 + ... + 2262.

It is an arithmetic number, because the mean of its divisors is an integer number (154360).

2^1640763 is an apocalyptic number.

1640763 is a deficient number, since it is larger than the sum of its proper divisors (828997).

1640763 is an equidigital number, since it uses as much as digits as its factorization.

1640763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983 (or 977 counting only the distinct ones).

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

The square root of 1640763 is about 1280.9227142962. The cubic root of 1640763 is about 117.9456562940.

The spelling of 1640763 in words is "one million, six hundred forty thousand, seven hundred sixty-three".