201872638 has 8 divisors (see below), whose sum is σ = 330337080. Its totient is φ = 91760280.

The previous prime is 201872621. The next prime is 201872647. The reversal of 201872638 is 836278102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 201872597 and 201872606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4587993 + ... + 4588036.

It is an arithmetic number, because the mean of its divisors is an integer number (41292135).

Almost surely, 2^201872638 is an apocalyptic number.

201872638 is a deficient number, since it is larger than the sum of its proper divisors (128464442).

201872638 is a wasteful number, since it uses less digits than its factorization.

201872638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9176042.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 201872638 is about 14208.1891175477. The cubic root of 201872638 is about 586.6230894084.

The spelling of 201872638 in words is "two hundred one million, eight hundred seventy-two thousand, six hundred thirty-eight".