1621439841 has 96 divisors (see below), whose sum is σ = 2786488320. Its totient is φ = 832809600.

The previous prime is 1621439797. The next prime is 1621439843. The reversal of 1621439841 is 1489341261.

It is not a de Polignac number, because 1621439841 - 2¹⁰ = 1621438817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1621439841.

It is not an unprimeable number, because it can be changed into a prime (1621439843) 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 95 ways as a sum of consecutive naturals, for example, 5281410 + ... + 5281716.

It is an arithmetic number, because the mean of its divisors is an integer number (29025920).

Almost surely, 2^1621439841 is an apocalyptic number.

It is an amenable number.

1621439841 is a deficient number, since it is larger than the sum of its proper divisors (1165048479).

1621439841 is a wasteful number, since it uses less digits than its factorization.

1621439841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 428 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 1621439841 is about 40267.1061910339. The cubic root of 1621439841 is about 1174.8081391277.

The spelling of 1621439841 in words is "one billion, six hundred twenty-one million, four hundred thirty-nine thousand, eight hundred forty-one".