135245840 has 20 divisors (see below), whose sum is σ = 314446764. Its totient is φ = 54098304.

The previous prime is 135245813. The next prime is 135245843. The reversal of 135245840 is 48542531.

It can be written as a sum of positive squares in 2 ways, for example, as 37552384 + 97693456 = 6128^2 + 9884^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 135245797 and 135245806.

It is not an unprimeable number, because it can be changed into a prime (135245843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 845207 + ... + 845366.

Almost surely, 2^135245840 is an apocalyptic number.

135245840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135245840 is an abundant number, since it is smaller than the sum of its proper divisors (179200924).

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

135245840 is a wasteful number, since it uses less digits than its factorization.

135245840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690586 (or 1690580 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 135245840 is about 11629.5244958683. The cubic root of 135245840 is about 513.3039881278.

The spelling of 135245840 in words is "one hundred thirty-five million, two hundred forty-five thousand, eight hundred forty".