1636434740 has 24 divisors (see below), whose sum is σ = 3444051912. Its totient is φ = 653137920.

The previous prime is 1636434719. The next prime is 1636434827. The reversal of 1636434740 is 474346361.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 293505424 + 1342929316 = 17132^2 + 36646^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1636434694 and 1636434703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80381 + ... + 98660.

It is an arithmetic number, because the mean of its divisors is an integer number (143502163).

Almost surely, 2^1636434740 is an apocalyptic number.

1636434740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1636434740 is an abundant number, since it is smaller than the sum of its proper divisors (1807617172).

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

1636434740 is a wasteful number, since it uses less digits than its factorization.

1636434740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179507 (or 179505 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 1636434740 is about 40452.8706027150. The cubic root of 1636434740 is about 1178.4185316159.

The spelling of 1636434740 in words is "one billion, six hundred thirty-six million, four hundred thirty-four thousand, seven hundred forty".