1621833916 has 12 divisors (see below), whose sum is σ = 2839070080. Its totient is φ = 810671040.

The previous prime is 1621833869. The next prime is 1621833929. The reversal of 1621833916 is 6193381261.

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, 46221 + ... + 73348.

Almost surely, 2^1621833916 is an apocalyptic number.

It is an amenable number.

1621833916 is a deficient number, since it is larger than the sum of its proper divisors (1217236164).

1621833916 is a wasteful number, since it uses less digits than its factorization.

1621833916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122964 (or 122962 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 1621833916 is about 40271.9991557410. Note that the first 3 decimals coincide. The cubic root of 1621833916 is about 1174.9033066047.

The spelling of 1621833916 in words is "one billion, six hundred twenty-one million, eight hundred thirty-three thousand, nine hundred sixteen".