1621416 has 16 divisors (see below), whose sum is σ = 4053600. Its totient is φ = 540464.

The previous prime is 1621397. The next prime is 1621421. The reversal of 1621416 is 6141261.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1621392 and 1621401.

It is an unprimeable number.

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, 33756 + ... + 33803.

It is an arithmetic number, because the mean of its divisors is an integer number (253350).

2^1621416 is an apocalyptic number.

It is an amenable number.

1621416 is an abundant number, since it is smaller than the sum of its proper divisors (2432184).

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

1621416 is a wasteful number, since it uses less digits than its factorization.

1621416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67568 (or 67564 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 1621416 is about 1273.3483419709. The cubic root of 1621416 is about 117.4802381131.

Adding to 1621416 its reverse (6141261), we get a palindrome (7762677).

The spelling of 1621416 in words is "one million, six hundred twenty-one thousand, four hundred sixteen".