145705786 has 4 divisors (see below), whose sum is σ = 218558682. Its totient is φ = 72852892.

The previous prime is 145705717. The next prime is 145705787. The reversal of 145705786 is 687507541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 687507541 = 7 ⋅98215363.

It can be written as a sum of positive squares in only one way, i.e., 76300225 + 69405561 = 8735^2 + 8331^2 .

It is not an unprimeable number, because it can be changed into a prime (145705787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36426445 + ... + 36426448.

Almost surely, 2^145705786 is an apocalyptic number.

145705786 is a deficient number, since it is larger than the sum of its proper divisors (72852896).

145705786 is an equidigital number, since it uses as much as digits as its factorization.

145705786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72852895.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 145705786 is about 12070.8651719750. The cubic root of 145705786 is about 526.2098007934.

The spelling of 145705786 in words is "one hundred forty-five million, seven hundred five thousand, seven hundred eighty-six".