138464649 has 12 divisors (see below), whose sum is σ = 200639556. Its totient is φ = 92016672.

The previous prime is 138464639. The next prime is 138464659. The reversal of 138464649 is 946464831.

It is an interprime number because it is at equal distance from previous prime (138464639) and next prime (138464659).

It can be written as a sum of positive squares in 2 ways, for example, as 61779600 + 76685049 = 7860^2 + 8757^2 .

It is not a de Polignac number, because 138464649 - 2¹³ = 138456457 is a prime.

It is a super-3 number, since 3×138464649³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138464639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21414 + ... + 27119.

It is an arithmetic number, because the mean of its divisors is an integer number (16719963).

Almost surely, 2^138464649 is an apocalyptic number.

It is an amenable number.

138464649 is a deficient number, since it is larger than the sum of its proper divisors (62174907).

138464649 is a wasteful number, since it uses less digits than its factorization.

138464649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48856 (or 48853 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 138464649 is about 11767.1002800180. The cubic root of 138464649 is about 517.3442617549.

The spelling of 138464649 in words is "one hundred thirty-eight million, four hundred sixty-four thousand, six hundred forty-nine".