45209823 has 4 divisors (see below), whose sum is σ = 60279768. Its totient is φ = 30139880.

The previous prime is 45209779. The next prime is 45209833. The reversal of 45209823 is 32890254.

It is a happy number.

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 45209823 - 2¹⁰ = 45208799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45209833) 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, 7534968 + ... + 7534973.

It is an arithmetic number, because the mean of its divisors is an integer number (15069942).

Almost surely, 2^45209823 is an apocalyptic number.

45209823 is a deficient number, since it is larger than the sum of its proper divisors (15069945).

45209823 is a wasteful number, since it uses less digits than its factorization.

45209823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15069944.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 45209823 is about 6723.8250274676. The cubic root of 45209823 is about 356.2413016036.

The spelling of 45209823 in words is "forty-five million, two hundred nine thousand, eight hundred twenty-three".