1635000138 has 12 divisors (see below), whose sum is σ = 3542500338. Its totient is φ = 545000040.

The previous prime is 1635000131. The next prime is 1635000161. The reversal of 1635000138 is 8310005361.

It can be written as a sum of positive squares in only one way, i.e., 911013489 + 723986649 = 30183^2 + 26907^2 .

It is not an unprimeable number, because it can be changed into a prime (1635000131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45416653 + ... + 45416688.

Almost surely, 2^1635000138 is an apocalyptic number.

1635000138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1635000138 is an abundant number, since it is smaller than the sum of its proper divisors (1907500200).

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

1635000138 is a wasteful number, since it uses less digits than its factorization.

1635000138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90833349 (or 90833346 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1635000138 is about 40435.1349447482. The cubic root of 1635000138 is about 1178.0740722455.

Adding to 1635000138 its reverse (8310005361), we get a palindrome (9945005499).

The spelling of 1635000138 in words is "one billion, six hundred thirty-five million, one hundred thirty-eight", and thus it is an aban number.