138554 has 12 divisors (see below), whose sum is σ = 226926. Its totient is φ = 63072.

The previous prime is 138547. The next prime is 138559. The reversal of 138554 is 455831.

138554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 104329 + 34225 = 323^2 + 185^2 .

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138554.

It is not an unprimeable number, because it can be changed into a prime (138559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1862 + ... + 1934.

2¹³⁸⁵⁵⁴ is an apocalyptic number.

138554 is a deficient number, since it is larger than the sum of its proper divisors (88372).

138554 is an equidigital number, since it uses as much as digits as its factorization.

138554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 88 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 138554 is about 372.2284244923. The cubic root of 138554 is about 51.7455518281.

Multiplying 138554 by its sum of digits (26), we get a square (3602404 = 1898²).

138554 divided by its sum of digits (26) gives a square (5329 = 73²).

The spelling of 138554 in words is "one hundred thirty-eight thousand, five hundred fifty-four".