1000000138 has 4 divisors (see below), whose sum is σ = 1500000210. Its totient is φ = 500000068.

The previous prime is 1000000123. The next prime is 1000000181. The reversal of 1000000138 is 8310000001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8310000001 = 1667 ⋅4985003.

It can be written as a sum of positive squares in only one way, i.e., 815502249 + 184497889 = 28557^2 + 13583^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250000033 + ... + 250000036.

Almost surely, 2^1000000138 is an apocalyptic number.

1000000138 is a deficient number, since it is larger than the sum of its proper divisors (500000072).

1000000138 is an equidigital number, since it uses as much as digits as its factorization.

1000000138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500000071.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1000000138 is about 31622.7787836553. The cubic root of 1000000138 is about 1000.0000460000. Note that the first 4 decimals are identical.

Adding to 1000000138 its reverse (8310000001), we get a palindrome (9310000139).

The spelling of 1000000138 in words is "one billion, one hundred thirty-eight", and thus it is an aban number.