138240869090 has 16 divisors (see below), whose sum is σ = 248959719288. Its totient is φ = 55268313216.

The previous prime is 138240869077. The next prime is 138240869113. The reversal of 138240869090 is 90968042831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 52252930921 + 85987938169 = 228589^2 + 293237^2 .

It is a super-2 number, since 2×138240869090² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3483587 + ... + 3523046.

Almost surely, 2^138240869090 is an apocalyptic number.

138240869090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138240869090 is a deficient number, since it is larger than the sum of its proper divisors (110718850198).

138240869090 is a wasteful number, since it uses less digits than its factorization.

138240869090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7008613.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 138240869090 in words is "one hundred thirty-eight billion, two hundred forty million, eight hundred sixty-nine thousand, ninety".