138245121490 has 96 divisors (see below), whose sum is σ = 306651167280. Its totient is φ = 44587597824.

The previous prime is 138245121481. The next prime is 138245121517. The reversal of 138245121490 is 94121542831.

It can be written as a sum of positive squares in 8 ways, for example, as 123496719241 + 14748402249 = 351421^2 + 121443^2 .

It is a super-2 number, since 2×138245121490² (a number of 23 digits) contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 26395152 + ... + 26400388.

Almost surely, 2^138245121490 is an apocalyptic number.

138245121490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138245121490 is an abundant number, since it is smaller than the sum of its proper divisors (168406045790).

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

138245121490 is a wasteful number, since it uses less digits than its factorization.

138245121490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8444 (or 8437 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 138245121490 in words is "one hundred thirty-eight billion, two hundred forty-five million, one hundred twenty-one thousand, four hundred ninety".