145555739 has 4 divisors (see below), whose sum is σ = 166349424. Its totient is φ = 124762056.

The previous prime is 145555733. The next prime is 145555747. The reversal of 145555739 is 937555541.

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

It is a cyclic number.

It is not a de Polignac number, because 145555739 - 2⁴ = 145555723 is a prime.

It is a super-2 number, since 2×145555739² = 42372946311672242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145555739.

It is not an unprimeable number, because it can be changed into a prime (145555733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10396832 + ... + 10396845.

It is an arithmetic number, because the mean of its divisors is an integer number (41587356).

Almost surely, 2^145555739 is an apocalyptic number.

145555739 is a deficient number, since it is larger than the sum of its proper divisors (20793685).

145555739 is an equidigital number, since it uses as much as digits as its factorization.

145555739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20793684.

The product of its digits is 472500, while the sum is 44.

The square root of 145555739 is about 12064.6483164658. The cubic root of 145555739 is about 526.0291094552.

The spelling of 145555739 in words is "one hundred forty-five million, five hundred fifty-five thousand, seven hundred thirty-nine".