135431442 has 12 divisors (see below), whose sum is σ = 293434830. Its totient is φ = 45143808.

The previous prime is 135431431. The next prime is 135431473. The reversal of 135431442 is 244134531.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 134583201 + 848241 = 11601^2 + 921^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3761967 + ... + 3762002.

Almost surely, 2^135431442 is an apocalyptic number.

135431442 is an abundant number, since it is smaller than the sum of its proper divisors (158003388).

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

135431442 is a wasteful number, since it uses less digits than its factorization.

135431442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7523977 (or 7523974 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 135431442 is about 11637.5015359827. The cubic root of 135431442 is about 513.5386883824.

Adding to 135431442 its reverse (244134531), we get a palindrome (379565973).

The spelling of 135431442 in words is "one hundred thirty-five million, four hundred thirty-one thousand, four hundred forty-two".