134405421 has 16 divisors (see below), whose sum is σ = 185377920. Its totient is φ = 86569440.

The previous prime is 134405419. The next prime is 134405437. The reversal of 134405421 is 124504431.

It is not a de Polignac number, because 134405421 - 2¹ = 134405419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 134405391 and 134405400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134405471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1304856 + ... + 1304958.

It is an arithmetic number, because the mean of its divisors is an integer number (11586120).

Almost surely, 2^134405421 is an apocalyptic number.

It is an amenable number.

134405421 is a deficient number, since it is larger than the sum of its proper divisors (50972499).

134405421 is an frugal number, since it uses more digits than its factorization.

134405421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 134405421 is about 11593.3351974313. The cubic root of 134405421 is about 512.2385528267.

Adding to 134405421 its reverse (124504431), we get a palindrome (258909852).

The spelling of 134405421 in words is "one hundred thirty-four million, four hundred five thousand, four hundred twenty-one".