138443525 has 12 divisors (see below), whose sum is σ = 187276704. Its totient is φ = 100686000.

The previous prime is 138443497. The next prime is 138443549. The reversal of 138443525 is 525344831.

It is not a de Polignac number, because 138443525 - 2¹⁰ = 138442501 is a prime.

It is a super-2 number, since 2×138443525² = 38333219228851250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 251441 + ... + 251990.

It is an arithmetic number, because the mean of its divisors is an integer number (15606392).

Almost surely, 2^138443525 is an apocalyptic number.

It is an amenable number.

138443525 is a deficient number, since it is larger than the sum of its proper divisors (48833179).

138443525 is a wasteful number, since it uses less digits than its factorization.

138443525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503452 (or 503447 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

The square root of 138443525 is about 11766.2026584621. The cubic root of 138443525 is about 517.3179519446.

The spelling of 138443525 in words is "one hundred thirty-eight million, four hundred forty-three thousand, five hundred twenty-five".