135397949 has 4 divisors (see below), whose sum is σ = 138700380. Its totient is φ = 132095520.

The previous prime is 135397919. The next prime is 135397957. The reversal of 135397949 is 949793531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80371225 + 55026724 = 8965^2 + 7418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135397949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135397897 and 135397906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135397919) 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, 1651154 + ... + 1651235.

It is an arithmetic number, because the mean of its divisors is an integer number (34675095).

Almost surely, 2^135397949 is an apocalyptic number.

It is an amenable number.

135397949 is a deficient number, since it is larger than the sum of its proper divisors (3302431).

135397949 is an equidigital number, since it uses as much as digits as its factorization.

135397949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302430.

The product of its digits is 918540, while the sum is 50.

The square root of 135397949 is about 11636.0624353774. The cubic root of 135397949 is about 513.4963511695.

The spelling of 135397949 in words is "one hundred thirty-five million, three hundred ninety-seven thousand, nine hundred forty-nine".