1621968508 has 12 divisors (see below), whose sum is σ = 2845033632. Its totient is φ = 809101760.

The previous prime is 1621968457. The next prime is 1621968539. The reversal of 1621968508 is 8058691261.

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, 468685 + ... + 472132.

It is an arithmetic number, because the mean of its divisors is an integer number (237086136).

Almost surely, 2^1621968508 is an apocalyptic number.

It is an amenable number.

1621968508 is a deficient number, since it is larger than the sum of its proper divisors (1223065124).

1621968508 is a wasteful number, since it uses less digits than its factorization.

1621968508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941252 (or 941250 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 1621968508 is about 40273.6701580574. The cubic root of 1621968508 is about 1174.9358064824.

The spelling of 1621968508 in words is "one billion, six hundred twenty-one million, nine hundred sixty-eight thousand, five hundred eight".