145240439 has 4 divisors (see below), whose sum is σ = 150248760. Its totient is φ = 140232120.

The previous prime is 145240379. The next prime is 145240441. The reversal of 145240439 is 934042541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934042541 = 37 ⋅25244393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145240439 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 (145240489) 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, 2504117 + ... + 2504174.

It is an arithmetic number, because the mean of its divisors is an integer number (37562190).

Almost surely, 2^145240439 is an apocalyptic number.

145240439 is a deficient number, since it is larger than the sum of its proper divisors (5008321).

145240439 is an equidigital number, since it uses as much as digits as its factorization.

145240439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008320.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 145240439 is about 12051.5741295484. The cubic root of 145240439 is about 525.6490102061.

The spelling of 145240439 in words is "one hundred forty-five million, two hundred forty thousand, four hundred thirty-nine".