1640416 has 12 divisors (see below), whose sum is σ = 3229632. Its totient is φ = 820192.

The previous prime is 1640399. The next prime is 1640423. The reversal of 1640416 is 6140461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25600 + ... + 25663.

It is an arithmetic number, because the mean of its divisors is an integer number (269136).

2^1640416 is an apocalyptic number.

1640416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1640416 is a deficient number, since it is larger than the sum of its proper divisors (1589216).

1640416 is an equidigital number, since it uses as much as digits as its factorization.

1640416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51273 (or 51265 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1640416 is about 1280.7872579004. The cubic root of 1640416 is about 117.9373410512.

Adding to 1640416 its reverse (6140461), we get a palindrome (7780877).

The spelling of 1640416 in words is "one million, six hundred forty thousand, four hundred sixteen".