201639996 has 96 divisors (see below), whose sum is σ = 544051200. Its totient is φ = 64514880.

The previous prime is 201639983. The next prime is 201640001. The reversal of 201639996 is 699936102.

It is a happy number.

201639996 is a `hidden beast` number, since 2 + 0 + 1 + 639 + 9 + 9 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 766561 + ... + 766823.

It is an arithmetic number, because the mean of its divisors is an integer number (5667200).

Almost surely, 2^201639996 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 201639996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272025600).

201639996 is an abundant number, since it is smaller than the sum of its proper divisors (342411204).

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

201639996 is a wasteful number, since it uses less digits than its factorization.

201639996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 201639996 is about 14199.9998591549. Note that the first 3 decimals coincide. The cubic root of 201639996 is about 586.3976574587.

The spelling of 201639996 in words is "two hundred one million, six hundred thirty-nine thousand, nine hundred ninety-six".