1629644399 has 4 divisors (see below), whose sum is σ = 1631037240. Its totient is φ = 1628251560.

The previous prime is 1629644389. The next prime is 1629644411. The reversal of 1629644399 is 9934469261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9934469261 = 1319 ⋅7531819.

It is a cyclic number.

It is not a de Polignac number, because 1629644399 - 2²⁸ = 1361208943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1629644399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1629644389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694664 + ... + 697005.

It is an arithmetic number, because the mean of its divisors is an integer number (407759310).

Almost surely, 2^1629644399 is an apocalyptic number.

1629644399 is a deficient number, since it is larger than the sum of its proper divisors (1392841).

1629644399 is a wasteful number, since it uses less digits than its factorization.

1629644399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392840.

The product of its digits is 2519424, while the sum is 53.

The square root of 1629644399 is about 40368.8543186452. The cubic root of 1629644399 is about 1176.7863335010.

The spelling of 1629644399 in words is "one billion, six hundred twenty-nine million, six hundred forty-four thousand, three hundred ninety-nine".