138954537 has 12 divisors (see below), whose sum is σ = 202782580. Its totient is φ = 91680768.

The previous prime is 138954479. The next prime is 138954589. The reversal of 138954537 is 735459831.

It can be written as a sum of positive squares in 2 ways, for example, as 24443136 + 114511401 = 4944^2 + 10701^2 .

It is not a de Polignac number, because 138954537 - 2⁸ = 138954281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138954492 and 138954501.

It is not an unprimeable number, because it can be changed into a prime (138952537) 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, 78712 + ... + 80457.

Almost surely, 2^138954537 is an apocalyptic number.

It is an amenable number.

138954537 is a deficient number, since it is larger than the sum of its proper divisors (63828043).

138954537 is a wasteful number, since it uses less digits than its factorization.

138954537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159272 (or 159269 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 138954537 is about 11787.8979042067. The cubic root of 138954537 is about 517.9536650514.

The spelling of 138954537 in words is "one hundred thirty-eight million, nine hundred fifty-four thousand, five hundred thirty-seven".