145240805 has 4 divisors (see below), whose sum is σ = 174288972. Its totient is φ = 116192640.

The previous prime is 145240801. The next prime is 145240853. The reversal of 145240805 is 508042541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508042541 = 16547 ⋅30703.

It can be written as a sum of positive squares in 2 ways, for example, as 48080356 + 97160449 = 6934^2 + 9857^2 .

It is not a de Polignac number, because 145240805 - 2² = 145240801 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 (145240801) 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, 14524076 + ... + 14524085.

It is an arithmetic number, because the mean of its divisors is an integer number (43572243).

Almost surely, 2^145240805 is an apocalyptic number.

It is an amenable number.

145240805 is a deficient number, since it is larger than the sum of its proper divisors (29048167).

145240805 is an equidigital number, since it uses as much as digits as its factorization.

145240805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29048166.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 145240805 is about 12051.5893142772. The cubic root of 145240805 is about 525.6494517438.

The spelling of 145240805 in words is "one hundred forty-five million, two hundred forty thousand, eight hundred five".