138308994 has 24 divisors (see below), whose sum is σ = 303892992. Its totient is φ = 45453240.

The previous prime is 138308987. The next prime is 138309001. The reversal of 138308994 is 499803831.

It is an interprime number because it is at equal distance from previous prime (138308987) and next prime (138309001).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52834 + ... + 55389.

It is an arithmetic number, because the mean of its divisors is an integer number (12662208).

Almost surely, 2^138308994 is an apocalyptic number.

138308994 is an abundant number, since it is smaller than the sum of its proper divisors (165583998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138308994 is a wasteful number, since it uses less digits than its factorization.

138308994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108302 (or 108299 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 138308994 is about 11760.4844287980. The cubic root of 138308994 is about 517.1503315944.

The spelling of 138308994 in words is "one hundred thirty-eight million, three hundred eight thousand, nine hundred ninety-four".