145923905 has 4 divisors (see below), whose sum is σ = 175108692. Its totient is φ = 116739120.

The previous prime is 145923901. The next prime is 145923907. The reversal of 145923905 is 509329541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83466496 + 62457409 = 9136^2 + 7903^2 .

It is not a de Polignac number, because 145923905 - 2² = 145923901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145923901) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 14592386 + ... + 14592395.

It is an arithmetic number, because the mean of its divisors is an integer number (43777173).

Almost surely, 2^145923905 is an apocalyptic number.

It is an amenable number.

145923905 is a deficient number, since it is larger than the sum of its proper divisors (29184787).

145923905 is an equidigital number, since it uses as much as digits as its factorization.

145923905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29184786.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 145923905 is about 12079.8967296910. The cubic root of 145923905 is about 526.4722454854.

The spelling of 145923905 in words is "one hundred forty-five million, nine hundred twenty-three thousand, nine hundred five".