139453 has 4 divisors (see below), whose sum is σ = 143260. Its totient is φ = 135648.

The previous prime is 139439. The next prime is 139457. The reversal of 139453 is 354931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 354931 = 29 ⋅12239.

It can be written as a sum of positive squares in 2 ways, for example, as 120409 + 19044 = 347^2 + 138^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139453 is a prime.

It is a d-powerful number, because it can be written as 1 + 3³ + 4³ + 9⁵ + 5⁷ + 3⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139457) 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, 1848 + ... + 1921.

It is an arithmetic number, because the mean of its divisors is an integer number (35815).

2¹³⁹⁴⁵³ is an apocalyptic number.

It is an amenable number.

139453 is a deficient number, since it is larger than the sum of its proper divisors (3807).

139453 is an equidigital number, since it uses as much as digits as its factorization.

139453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806.

The product of its digits is 1620, while the sum is 25.

The square root of 139453 is about 373.4340637917. The cubic root of 139453 is about 51.8572266978.

The spelling of 139453 in words is "one hundred thirty-nine thousand, four hundred fifty-three".