145447 has 4 divisors (see below), whose sum is σ = 149416. Its totient is φ = 141480.

The previous prime is 145441. The next prime is 145451. The reversal of 145447 is 744541.

145447 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744541 = 7 ⋅106363.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145447 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 145447.

It is not an unprimeable number, because it can be changed into a prime (145441) 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, 1929 + ... + 2002.

It is an arithmetic number, because the mean of its divisors is an integer number (37354).

2¹⁴⁵⁴⁴⁷ is an apocalyptic number.

145447 is a deficient number, since it is larger than the sum of its proper divisors (3969).

145447 is an equidigital number, since it uses as much as digits as its factorization.

145447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968.

The product of its digits is 2240, while the sum is 25.

The square root of 145447 is about 381.3751433956. The cubic root of 145447 is about 52.5898084897.

Adding to 145447 its reverse (744541), we get a palindrome (889988).

The spelling of 145447 in words is "one hundred forty-five thousand, four hundred forty-seven".