1636422749 has 16 divisors (see below), whose sum is σ = 1805983872. Its totient is φ = 1473208128.

The previous prime is 1636422731. The next prime is 1636422763. The reversal of 1636422749 is 9472246361.

It is a cyclic number.

It is not a de Polignac number, because 1636422749 - 2⁸ = 1636422493 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636422719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458279 + ... + 461835.

It is an arithmetic number, because the mean of its divisors is an integer number (112873992).

Almost surely, 2^1636422749 is an apocalyptic number.

It is an amenable number.

1636422749 is a deficient number, since it is larger than the sum of its proper divisors (169561123).

1636422749 is a wasteful number, since it uses less digits than its factorization.

1636422749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436.

The product of its digits is 435456, while the sum is 44.

The square root of 1636422749 is about 40452.7223929367. The cubic root of 1636422749 is about 1178.4156533157.

The spelling of 1636422749 in words is "one billion, six hundred thirty-six million, four hundred twenty-two thousand, seven hundred forty-nine".