1640316 has 12 divisors (see below), whose sum is σ = 3827432. Its totient is φ = 546768.

The previous prime is 1640311. The next prime is 1640323. The reversal of 1640316 is 6130461.

1640316 = 114² + 115² + ... + 185².

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1640292 and 1640301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640311) 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 3 ways as a sum of consecutive naturals, for example, 68335 + ... + 68358.

2^1640316 is an apocalyptic number.

It is an amenable number.

1640316 is an abundant number, since it is smaller than the sum of its proper divisors (2187116).

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

1640316 is a wasteful number, since it uses less digits than its factorization.

1640316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136700 (or 136698 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1640316 is about 1280.7482188159. The cubic root of 1640316 is about 117.9349445100.

Adding to 1640316 its reverse (6130461), we get a palindrome (7770777).

The spelling of 1640316 in words is "one million, six hundred forty thousand, three hundred sixteen".