138997874 has 8 divisors (see below), whose sum is σ = 208570368. Its totient is φ = 69474420.

The previous prime is 138997861. The next prime is 138997877. The reversal of 138997874 is 478799831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138997877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4082 + ... + 17165.

It is an arithmetic number, because the mean of its divisors is an integer number (26071296).

Almost surely, 2^138997874 is an apocalyptic number.

138997874 is a deficient number, since it is larger than the sum of its proper divisors (69572494).

138997874 is a wasteful number, since it uses less digits than its factorization.

138997874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24520.

The product of its digits is 3048192, while the sum is 56.

The square root of 138997874 is about 11789.7359597236. The cubic root of 138997874 is about 518.0075057424.

The spelling of 138997874 in words is "one hundred thirty-eight million, nine hundred ninety-seven thousand, eight hundred seventy-four".