621342009 has 48 divisors (see below), whose sum is σ = 984747840. Its totient is φ = 391927896.

The previous prime is 621341969. The next prime is 621342013. The reversal of 621342009 is 900243126.

621342009 is a `hidden beast` number, since 621 + 34 + 2 + 0 + 0 + 9 = 666.

It is not a de Polignac number, because 621342009 - 2⁸ = 621341753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (621342089) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 789114 + ... + 789900.

It is an arithmetic number, because the mean of its divisors is an integer number (20515580).

Almost surely, 2^621342009 is an apocalyptic number.

It is an amenable number.

621342009 is a deficient number, since it is larger than the sum of its proper divisors (363405831).

621342009 is an frugal number, since it uses more digits than its factorization.

With its successor (621342010) it forms an eRAP, since the sums of their prime factors are consecutive (846 and 847).

621342009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 621342009 is about 24926.7328184020. The cubic root of 621342009 is about 853.3166880942.

The spelling of 621342009 in words is "six hundred twenty-one million, three hundred forty-two thousand, nine".