135721398 has 16 divisors (see below), whose sum is σ = 278063856. Its totient is φ = 44136960.

The previous prime is 135721361. The next prime is 135721429. The reversal of 135721398 is 893127531.

135721398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 275611 + ... + 276102.

It is an arithmetic number, because the mean of its divisors is an integer number (17378991).

Almost surely, 2^135721398 is an apocalyptic number.

135721398 is an abundant number, since it is smaller than the sum of its proper divisors (142342458).

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

135721398 is a wasteful number, since it uses less digits than its factorization.

135721398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551759.

The product of its digits is 45360, while the sum is 39.

The square root of 135721398 is about 11649.9527037667. The cubic root of 135721398 is about 513.9049191517.

The spelling of 135721398 in words is "one hundred thirty-five million, seven hundred twenty-one thousand, three hundred ninety-eight".