145405 has 8 divisors (see below), whose sum is σ = 187992. Its totient is φ = 107328.

The previous prime is 145399. The next prime is 145417. The reversal of 145405 is 504541.

It can be written as a sum of positive squares in 4 ways, for example, as 11449 + 133956 = 107^2 + 366^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145405 - 2¹¹ = 143357 is a prime.

It is a super-2 number, since 2×145405² = 42285228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1054 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (23499).

2¹⁴⁵⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

145405 is a deficient number, since it is larger than the sum of its proper divisors (42587).

145405 is a wasteful number, since it uses less digits than its factorization.

145405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 145405 is about 381.3200755271. The cubic root of 145405 is about 52.5847459707.

Adding to 145405 its reverse (504541), we get a palindrome (649946).

The spelling of 145405 in words is "one hundred forty-five thousand, four hundred five".