1640506 has 16 divisors (see below), whose sum is σ = 2889216. Its totient is φ = 683856.

The previous prime is 1640503. The next prime is 1640519. The reversal of 1640506 is 6050461.

It is not an unprimeable number, because it can be changed into a prime (1640503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1066 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (180576).

2^1640506 is an apocalyptic number.

1640506 is a deficient number, since it is larger than the sum of its proper divisors (1248710).

1640506 is a wasteful number, since it uses less digits than its factorization.

1640506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1640506 is about 1280.8223920591. The cubic root of 1640506 is about 117.9394978550.

Adding to 1640506 its reverse (6050461), we get a palindrome (7690967).

The spelling of 1640506 in words is "one million, six hundred forty thousand, five hundred six".