138794509 has 12 divisors (see below), whose sum is σ = 163404864. Its totient is φ = 117529944.

The previous prime is 138794507. The next prime is 138794567. The reversal of 138794509 is 905497831.

It is a happy number.

It is not a de Polignac number, because 138794509 - 2¹ = 138794507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138794507) 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, 12997 + ... + 21130.

It is an arithmetic number, because the mean of its divisors is an integer number (13617072).

Almost surely, 2^138794509 is an apocalyptic number.

It is an amenable number.

138794509 is a deficient number, since it is larger than the sum of its proper divisors (24610355).

138794509 is an equidigital number, since it uses as much as digits as its factorization.

138794509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34224 (or 34217 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 138794509 is about 11781.1081397295. The cubic root of 138794509 is about 517.7547536414.

The spelling of 138794509 in words is "one hundred thirty-eight million, seven hundred ninety-four thousand, five hundred nine".