201490238638 has 64 divisors (see below), whose sum is σ = 351671040000. Its totient is φ = 85791239424.

The previous prime is 201490238617. The next prime is 201490238639. The reversal of 201490238638 is 836832094102.

201490238638 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201490238639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4598578 + ... + 4642186.

It is an arithmetic number, because the mean of its divisors is an integer number (5494860000).

Almost surely, 2^201490238638 is an apocalyptic number.

201490238638 is a deficient number, since it is larger than the sum of its proper divisors (150180801362).

201490238638 is a wasteful number, since it uses less digits than its factorization.

201490238638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43889.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 201490238638 in words is "two hundred one billion, four hundred ninety million, two hundred thirty-eight thousand, six hundred thirty-eight".