138407254 has 4 divisors (see below), whose sum is σ = 207610884. Its totient is φ = 69203626.

The previous prime is 138407249. The next prime is 138407257. The reversal of 138407254 is 452704831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 452704831 = 6689 ⋅67679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138407257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34601812 + ... + 34601815.

It is an arithmetic number, because the mean of its divisors is an integer number (51902721).

Almost surely, 2^138407254 is an apocalyptic number.

138407254 is a deficient number, since it is larger than the sum of its proper divisors (69203630).

138407254 is an equidigital number, since it uses as much as digits as its factorization.

138407254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69203629.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 138407254 is about 11764.6612360918. The cubic root of 138407254 is about 517.2727703966.

The spelling of 138407254 in words is "one hundred thirty-eight million, four hundred seven thousand, two hundred fifty-four".