201605436 has 72 divisors (see below), whose sum is σ = 531533184. Its totient is φ = 66815280.

The previous prime is 201605407. The next prime is 201605473. The reversal of 201605436 is 634506102.

201605436 is a `hidden beast` number, since 20 + 1 + 605 + 4 + 36 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204601 + ... + 205583.

Almost surely, 2^201605436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201605436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265766592).

201605436 is an abundant number, since it is smaller than the sum of its proper divisors (329927748).

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

201605436 is a wasteful number, since it uses less digits than its factorization.

201605436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213 (or 1199 counting only the distinct ones).

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

The square root of 201605436 is about 14198.7829055874. The cubic root of 201605436 is about 586.3641537534.

The spelling of 201605436 in words is "two hundred one million, six hundred five thousand, four hundred thirty-six".