145666439 has 4 divisors (see below), whose sum is σ = 145855656. Its totient is φ = 145477224.

The previous prime is 145666397. The next prime is 145666453. The reversal of 145666439 is 934666541.

145666439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934666541 = 1019 ⋅917239.

It is a cyclic number.

It is not a de Polignac number, because 145666439 - 2¹² = 145662343 is a prime.

It is a super-2 number, since 2×145666439² = 42437422901881442, 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 145666439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145666639) 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, 93449 + ... + 94994.

It is an arithmetic number, because the mean of its divisors is an integer number (36463914).

Almost surely, 2^145666439 is an apocalyptic number.

145666439 is a deficient number, since it is larger than the sum of its proper divisors (189217).

145666439 is an equidigital number, since it uses as much as digits as its factorization.

145666439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189216.

The product of its digits is 466560, while the sum is 44.

The square root of 145666439 is about 12069.2352284641. The cubic root of 145666439 is about 526.1624298971.

The spelling of 145666439 in words is "one hundred forty-five million, six hundred sixty-six thousand, four hundred thirty-nine".