135406421 has 6 divisors (see below), whose sum is σ = 139166370. Its totient is φ = 131745456.

The previous prime is 135406417. The next prime is 135406429. The reversal of 135406421 is 124604531.

It can be written as a sum of positive squares in 3 ways, for example, as 104325796 + 31080625 = 10214^2 + 5575^2 .

It is not a de Polignac number, because 135406421 - 2² = 135406417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135406429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48086 + ... + 50823.

It is an arithmetic number, because the mean of its divisors is an integer number (23194395).

Almost surely, 2^135406421 is an apocalyptic number.

It is an amenable number.

135406421 is a deficient number, since it is larger than the sum of its proper divisors (3759949).

135406421 is an frugal number, since it uses more digits than its factorization.

135406421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98983 (or 98946 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 135406421 is about 11636.4264703559. The cubic root of 135406421 is about 513.5070609584.

The spelling of 135406421 in words is "one hundred thirty-five million, four hundred six thousand, four hundred twenty-one".