1620416 has 28 divisors (see below), whose sum is σ = 3675888. Its totient is φ = 694272.

The previous prime is 1620413. The next prime is 1620431. The reversal of 1620416 is 6140261.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1361 + ... + 2256.

2^1620416 is an apocalyptic number.

1620416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1620416 is an abundant number, since it is smaller than the sum of its proper divisors (2055472).

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

1620416 is an equidigital number, since it uses as much as digits as its factorization.

1620416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636 (or 3626 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1620416 is about 1272.9556158798. The cubic root of 1620416 is about 117.4560813681.

Adding to 1620416 its reverse (6140261), we get a palindrome (7760677).

The spelling of 1620416 in words is "one million, six hundred twenty thousand, four hundred sixteen".