135997220 has 12 divisors (see below), whose sum is σ = 285594204. Its totient is φ = 54398880.

The previous prime is 135997189. The next prime is 135997223. The reversal of 135997220 is 22799531.

It can be written as a sum of positive squares in 2 ways, for example, as 38738176 + 97259044 = 6224^2 + 9862^2 .

It is not an unprimeable number, because it can be changed into a prime (135997223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3399911 + ... + 3399950.

It is an arithmetic number, because the mean of its divisors is an integer number (23799517).

Almost surely, 2^135997220 is an apocalyptic number.

135997220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135997220 is an abundant number, since it is smaller than the sum of its proper divisors (149596984).

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

135997220 is a wasteful number, since it uses less digits than its factorization.

135997220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6799870 (or 6799868 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 135997220 is about 11661.7845975648. The cubic root of 135997220 is about 514.2528141064.

The spelling of 135997220 in words is "one hundred thirty-five million, nine hundred ninety-seven thousand, two hundred twenty".