135969640 has 16 divisors (see below), whose sum is σ = 305931780. Its totient is φ = 54387840.

The previous prime is 135969607. The next prime is 135969667. The reversal of 135969640 is 46969531.

It can be written as a sum of positive squares in 2 ways, for example, as 116942596 + 19027044 = 10814^2 + 4362^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1699581 + ... + 1699660.

Almost surely, 2^135969640 is an apocalyptic number.

135969640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135969640 is an abundant number, since it is smaller than the sum of its proper divisors (169962140).

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

135969640 is a wasteful number, since it uses less digits than its factorization.

135969640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399252 (or 3399248 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 135969640 is about 11660.6020427764. The cubic root of 135969640 is about 514.2180485637.

The spelling of 135969640 in words is "one hundred thirty-five million, nine hundred sixty-nine thousand, six hundred forty".