202139640 has 96 divisors (see below), whose sum is σ = 685545120. Its totient is φ = 51558144.

The previous prime is 202139633. The next prime is 202139653. The reversal of 202139640 is 46931202.

202139640 is a `hidden beast` number, since 2 + 0 + 2 + 13 + 9 + 640 = 666.

202139640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 2.

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, 3927 + ... + 20486.

It is an arithmetic number, because the mean of its divisors is an integer number (7141095).

Almost surely, 2^202139640 is an apocalyptic number.

202139640 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 202139640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342772560).

202139640 is an abundant number, since it is smaller than the sum of its proper divisors (483405480).

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

202139640 is a wasteful number, since it uses less digits than its factorization.

202139640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24453 (or 24446 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 202139640 is about 14217.5820729124. The cubic root of 202139640 is about 586.8816031199.

The spelling of 202139640 in words is "two hundred two million, one hundred thirty-nine thousand, six hundred forty".