1621956938 has 48 divisors (see below), whose sum is σ = 2954692584. Its totient is φ = 665159040.

The previous prime is 1621956937. The next prime is 1621956943. The reversal of 1621956938 is 8396591261.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 757185289 + 864771649 = 27517^2 + 29407^2 .

It is not an unprimeable number, because it can be changed into a prime (1621956937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217520 + ... + 224852.

Almost surely, 2^1621956938 is an apocalyptic number.

1621956938 is a deficient number, since it is larger than the sum of its proper divisors (1332735646).

1621956938 is a wasteful number, since it uses less digits than its factorization.

1621956938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7447 (or 7440 counting only the distinct ones).

The product of its digits is 699840, while the sum is 50.

The square root of 1621956938 is about 40273.5265155660. The cubic root of 1621956938 is about 1174.9330127497.

The spelling of 1621956938 in words is "one billion, six hundred twenty-one million, nine hundred fifty-six thousand, nine hundred thirty-eight".