1636213420 has 24 divisors (see below), whose sum is σ = 3439959264. Its totient is φ = 653740416.

The previous prime is 1636213417. The next prime is 1636213427. The reversal of 1636213420 is 243126361.

It is not an unprimeable number, because it can be changed into a prime (1636213427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28377 + ... + 63856.

It is an arithmetic number, because the mean of its divisors is an integer number (143331636).

Almost surely, 2^1636213420 is an apocalyptic number.

1636213420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1636213420 is an abundant number, since it is smaller than the sum of its proper divisors (1803745844).

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

1636213420 is a wasteful number, since it uses less digits than its factorization.

1636213420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93129 (or 93127 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1636213420 is about 40450.1349812334. The cubic root of 1636213420 is about 1178.3654040572.

Adding to 1636213420 its reverse (243126361), we get a palindrome (1879339781).

The spelling of 1636213420 in words is "one billion, six hundred thirty-six million, two hundred thirteen thousand, four hundred twenty".