45439209 has 6 divisors (see below), whose sum is σ = 65634426. Its totient is φ = 30292800.

The previous prime is 45439183. The next prime is 45439213. The reversal of 45439209 is 90293454.

It can be written as a sum of positive squares in only one way, i.e., 42968025 + 2471184 = 6555^2 + 1572^2 .

It is not a de Polignac number, because 45439209 - 2⁷ = 45439081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45439109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2524392 + ... + 2524409.

It is an arithmetic number, because the mean of its divisors is an integer number (10939071).

Almost surely, 2^45439209 is an apocalyptic number.

It is an amenable number.

45439209 is a deficient number, since it is larger than the sum of its proper divisors (20195217).

45439209 is a wasteful number, since it uses less digits than its factorization.

45439209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048807 (or 5048804 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 45439209 is about 6740.8611467675. The cubic root of 45439209 is about 356.8427855656.

The spelling of 45439209 in words is "forty-five million, four hundred thirty-nine thousand, two hundred nine".