135881840 has 40 divisors (see below), whose sum is σ = 316506528. Its totient is φ = 54252800.

The previous prime is 135881819. The next prime is 135881857. The reversal of 135881840 is 48188531.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 135881794 and 135881803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54869 + ... + 57291.

Almost surely, 2^135881840 is an apocalyptic number.

135881840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135881840 is an abundant number, since it is smaller than the sum of its proper divisors (180624688).

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

135881840 is a wasteful number, since it uses less digits than its factorization.

135881840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137 (or 3131 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 135881840 is about 11656.8366206274. The cubic root of 135881840 is about 514.1073423156.

The spelling of 135881840 in words is "one hundred thirty-five million, eight hundred eighty-one thousand, eight hundred forty".