1336721436 has 36 divisors (see below), whose sum is σ = 3396104712. Its totient is φ = 443309664.

The previous prime is 1336721431. The next prime is 1336721443. The reversal of 1336721436 is 6341276331.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1336721436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1336721431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87150 + ... + 101333.

It is an arithmetic number, because the mean of its divisors is an integer number (94336242).

Almost surely, 2^1336721436 is an apocalyptic number.

It is an amenable number.

1336721436 is an abundant number, since it is smaller than the sum of its proper divisors (2059383276).

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

1336721436 is a wasteful number, since it uses less digits than its factorization.

1336721436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188690 (or 188685 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 1336721436 is about 36561.2012384714. The cubic root of 1336721436 is about 1101.5739001289.

Adding to 1336721436 its reverse (6341276331), we get a palindrome (7677997767).

The spelling of 1336721436 in words is "one billion, three hundred thirty-six million, seven hundred twenty-one thousand, four hundred thirty-six".