145405439 has 4 divisors (see below), whose sum is σ = 145643256. Its totient is φ = 145167624.

The previous prime is 145405367. The next prime is 145405457. The reversal of 145405439 is 934504541.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145405439 is a prime.

It is a super-2 number, since 2×145405439² = 42285483381565442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145405399 and 145405408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145404439) 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, 117989 + ... + 119214.

It is an arithmetic number, because the mean of its divisors is an integer number (36410814).

Almost surely, 2^145405439 is an apocalyptic number.

145405439 is a deficient number, since it is larger than the sum of its proper divisors (237817).

145405439 is an equidigital number, since it uses as much as digits as its factorization.

145405439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237816.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 145405439 is about 12058.4177651962. The cubic root of 145405439 is about 525.8479889113.

The spelling of 145405439 in words is "one hundred forty-five million, four hundred five thousand, four hundred thirty-nine".