135981240 has 32 divisors (see below), whose sum is σ = 407944080. Its totient is φ = 36261632.

The previous prime is 135981227. The next prime is 135981281. The reversal of 135981240 is 42189531.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 566469 + ... + 566708.

Almost surely, 2^135981240 is an apocalyptic number.

135981240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135981240 is an abundant number, since it is smaller than the sum of its proper divisors (271962840).

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

135981240 is a wasteful number, since it uses less digits than its factorization.

135981240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133191 (or 1133187 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 135981240 is about 11661.0994335869. The cubic root of 135981240 is about 514.2326713371.

The spelling of 135981240 in words is "one hundred thirty-five million, nine hundred eighty-one thousand, two hundred forty".