1621447572 has 24 divisors (see below), whose sum is σ = 3791289600. Its totient is φ = 539352256.

The previous prime is 1621447571. The next prime is 1621447613. The reversal of 1621447572 is 2757441261.

It is a self number, because there is not a number n which added to its sum of digits gives 1621447572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621447571) 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 7 ways as a sum of consecutive naturals, for example, 135297 + ... + 146792.

It is an arithmetic number, because the mean of its divisors is an integer number (157970400).

Almost surely, 2^1621447572 is an apocalyptic number.

1621447572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621447572 is an abundant number, since it is smaller than the sum of its proper divisors (2169842028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621447572 is a wasteful number, since it uses less digits than its factorization.

1621447572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282575 (or 282573 counting only the distinct ones).

The product of its digits is 94080, while the sum is 39.

The square root of 1621447572 is about 40267.2021873882. The cubic root of 1621447572 is about 1174.8100062804.

The spelling of 1621447572 in words is "one billion, six hundred twenty-one million, four hundred forty-seven thousand, five hundred seventy-two".