135621432 has 64 divisors (see below), whose sum is σ = 393120000. Its totient is φ = 43240032.

The previous prime is 135621407. The next prime is 135621443. The reversal of 135621432 is 234126531.

135621432 is a `hidden beast` number, since 1 + 3 + 5 + 621 + 4 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 135621396 and 135621405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8682 + ... + 18617.

It is an arithmetic number, because the mean of its divisors is an integer number (6142500).

Almost surely, 2^135621432 is an apocalyptic number.

135621432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

135621432 is an abundant number, since it is smaller than the sum of its proper divisors (257498568).

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

135621432 is a wasteful number, since it uses less digits than its factorization.

135621432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27337 (or 27327 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 135621432 is about 11645.6615097641. The cubic root of 135621432 is about 513.7787154284.

Adding to 135621432 its reverse (234126531), we get a palindrome (369747963).

The spelling of 135621432 in words is "one hundred thirty-five million, six hundred twenty-one thousand, four hundred thirty-two".