1621209072 has 40 divisors (see below), whose sum is σ = 4786427776. Its totient is φ = 463202496.

The previous prime is 1621209047. The next prime is 1621209089. The reversal of 1621209072 is 2709021261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2412178 + ... + 2412849.

Almost surely, 2^1621209072 is an apocalyptic number.

1621209072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621209072 is an abundant number, since it is smaller than the sum of its proper divisors (3165218704).

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

1621209072 is a wasteful number, since it uses less digits than its factorization.

1621209072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825045 (or 4825039 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1621209072 is about 40264.2406112421. The cubic root of 1621209072 is about 1174.7524022131.

The spelling of 1621209072 in words is "one billion, six hundred twenty-one million, two hundred nine thousand, seventy-two".