155447 has 4 divisors (see below), whose sum is σ = 156240. Its totient is φ = 154656.

The previous prime is 155443. The next prime is 155453. The reversal of 155447 is 744551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 744551 = 37 ⋅20123.

It is a cyclic number.

It is not a de Polignac number, because 155447 - 2² = 155443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155443) 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, 143 + ... + 575.

It is an arithmetic number, because the mean of its divisors is an integer number (39060).

2¹⁵⁵⁴⁴⁷ is an apocalyptic number.

155447 is a deficient number, since it is larger than the sum of its proper divisors (793).

155447 is an equidigital number, since it uses as much as digits as its factorization.

155447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792.

The product of its digits is 2800, while the sum is 26.

The square root of 155447 is about 394.2676755708. The cubic root of 155447 is about 53.7684414817.

Adding to 155447 its reverse (744551), we get a palindrome (899998).

It can be divided in two parts, 15544 and 7, that added together give a palindrome (15551).

The spelling of 155447 in words is "one hundred fifty-five thousand, four hundred forty-seven".