135121640 has 16 divisors (see below), whose sum is σ = 304023780. Its totient is φ = 54048640.

The previous prime is 135121631. The next prime is 135121681. The reversal of 135121640 is 46121531.

It can be written as a sum of positive squares in 2 ways, for example, as 125843524 + 9278116 = 11218^2 + 3046^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1688981 + ... + 1689060.

Almost surely, 2^135121640 is an apocalyptic number.

135121640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135121640 is an abundant number, since it is smaller than the sum of its proper divisors (168902140).

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

135121640 is a wasteful number, since it uses less digits than its factorization.

135121640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378052 (or 3378048 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 135121640 is about 11624.1834121800. The cubic root of 135121640 is about 513.1468129164.

The spelling of 135121640 in words is "one hundred thirty-five million, one hundred twenty-one thousand, six hundred forty".