1921616 has 20 divisors (see below), whose sum is σ = 3770592. Its totient is φ = 948576.

The previous prime is 1921573. The next prime is 1921631. The reversal of 1921616 is 6161291.

1921616 is a modest number, since divided by 1616 gives 192 as remainder.

It is a plaindrome in base 7.

It is a zygodrome in base 7.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605 + ... + 2051.

2^1921616 is an apocalyptic number.

1921616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1921616 is a deficient number, since it is larger than the sum of its proper divisors (1848976).

1921616 is a wasteful number, since it uses less digits than its factorization.

1921616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538 (or 1532 counting only the distinct ones).

The product of its digits is 648, while the sum is 26.

The square root of 1921616 is about 1386.2236471796. The cubic root of 1921616 is about 124.3241605134.

The spelling of 1921616 in words is "one million, nine hundred twenty-one thousand, six hundred sixteen".