138054821 has 4 divisors (see below), whose sum is σ = 138150144. Its totient is φ = 137959500.

The previous prime is 138054803. The next prime is 138054823. The reversal of 138054821 is 128450831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138054821 - 2²⁶ = 70945957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138054823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45455 + ... + 48396.

It is an arithmetic number, because the mean of its divisors is an integer number (34537536).

Almost surely, 2^138054821 is an apocalyptic number.

It is an amenable number.

138054821 is a deficient number, since it is larger than the sum of its proper divisors (95323).

138054821 is an equidigital number, since it uses as much as digits as its factorization.

138054821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95322.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 138054821 is about 11749.6732294988. The cubic root of 138054821 is about 516.8333450901.

The spelling of 138054821 in words is "one hundred thirty-eight million, fifty-four thousand, eight hundred twenty-one".