138142025 has 36 divisors (see below), whose sum is σ = 207968832. Its totient is φ = 90588960.

The previous prime is 138142013. The next prime is 138142049. The reversal of 138142025 is 520241831.

138142025 = T₂₃₅₀ + T₂₃₅₁ + ... + T₂₃₉₈.

It is not a de Polignac number, because 138142025 - 2¹² = 138137929 is a prime.

It is a super-2 number, since 2×138142025² = 38166438142201250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138141985 and 138142003.

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 35 ways as a sum of consecutive naturals, for example, 25724 + ... + 30626.

It is an arithmetic number, because the mean of its divisors is an integer number (5776912).

Almost surely, 2^138142025 is an apocalyptic number.

It is an amenable number.

138142025 is a deficient number, since it is larger than the sum of its proper divisors (69826807).

138142025 is a wasteful number, since it uses less digits than its factorization.

138142025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950 (or 4938 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 138142025 is about 11753.3835553852. The cubic root of 138142025 is about 516.9421435331.

Adding to 138142025 its reverse (520241831), we get a palindrome (658383856).

The spelling of 138142025 in words is "one hundred thirty-eight million, one hundred forty-two thousand, twenty-five".