135643988 has 6 divisors (see below), whose sum is σ = 237376986. Its totient is φ = 67821992.

The previous prime is 135643967. The next prime is 135643993. The reversal of 135643988 is 889346531.

It can be written as a sum of positive squares in only one way, i.e., 113252164 + 22391824 = 10642^2 + 4732^2 .

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 as a sum of consecutive naturals, namely, 16955495 + ... + 16955502.

It is an arithmetic number, because the mean of its divisors is an integer number (39562831).

Almost surely, 2^135643988 is an apocalyptic number.

It is an amenable number.

135643988 is a deficient number, since it is larger than the sum of its proper divisors (101732998).

135643988 is a wasteful number, since it uses less digits than its factorization.

135643988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33911001 (or 33910999 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The square root of 135643988 is about 11646.6298988162. The cubic root of 135643988 is about 513.8071970386.

It can be divided in two parts, 135643 and 988, that added together give a palindrome (136631).

The spelling of 135643988 in words is "one hundred thirty-five million, six hundred forty-three thousand, nine hundred eighty-eight".