138249693 has 8 divisors (see below), whose sum is σ = 204814400. Its totient is φ = 92166444.

The previous prime is 138249691. The next prime is 138249703. The reversal of 138249693 is 396942831.

It is a happy number.

It is not a de Polignac number, because 138249693 - 2¹ = 138249691 is a prime.

It is a super-2 number, since 2×138249693² = 38225955229188498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138249691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2560153 + ... + 2560206.

It is an arithmetic number, because the mean of its divisors is an integer number (25601800).

Almost surely, 2^138249693 is an apocalyptic number.

It is an amenable number.

138249693 is a deficient number, since it is larger than the sum of its proper divisors (66564707).

138249693 is an equidigital number, since it uses as much as digits as its factorization.

138249693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120368 (or 5120362 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 138249693 is about 11757.9629613297. The cubic root of 138249693 is about 517.0764103573.

The spelling of 138249693 in words is "one hundred thirty-eight million, two hundred forty-nine thousand, six hundred ninety-three".