1629638409 has 8 divisors (see below), whose sum is σ = 2483258560. Its totient is φ = 931221936.

The previous prime is 1629638407. The next prime is 1629638431. The reversal of 1629638409 is 9048369261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1629638409 - 2¹ = 1629638407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1629638401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38800894 + ... + 38800935.

It is an arithmetic number, because the mean of its divisors is an integer number (310407320).

Almost surely, 2^1629638409 is an apocalyptic number.

It is an amenable number.

1629638409 is a deficient number, since it is larger than the sum of its proper divisors (853620151).

1629638409 is an equidigital number, since it uses as much as digits as its factorization.

1629638409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77601839.

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 1629638409 is about 40368.7801277175. The cubic root of 1629638409 is about 1176.7848916816.

The spelling of 1629638409 in words is "one billion, six hundred twenty-nine million, six hundred thirty-eight thousand, four hundred nine".