201433840 has 40 divisors (see below), whose sum is σ = 471777840. Its totient is φ = 79981056.

The previous prime is 201433829. The next prime is 201433909. The reversal of 201433840 is 48334102.

It is a tau number, because it is divible by the number of its divisors (40).

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, 1771 + ... + 20149.

It is an arithmetic number, because the mean of its divisors is an integer number (11794446).

Almost surely, 2^201433840 is an apocalyptic number.

201433840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201433840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235888920).

201433840 is an abundant number, since it is smaller than the sum of its proper divisors (270344000).

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

201433840 is a wasteful number, since it uses less digits than its factorization.

201433840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18529 (or 18523 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 201433840 is about 14192.7389886519. The cubic root of 201433840 is about 586.1977457013.

Adding to 201433840 its reverse (48334102), we get a palindrome (249767942).

The spelling of 201433840 in words is "two hundred one million, four hundred thirty-three thousand, eight hundred forty".