45442 has 4 divisors (see below), whose sum is σ = 68166.
Its totient is φ = 22720.
The previous prime is 45439. The next prime is 45481. The reversal of 45442 is 24454.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24454 = 2 ⋅12227.
It can be written as a sum of positive squares in only one way, i.e., 40401 + 5041 = 201^2 + 71^2
It is a plaindrome in base 12 and base 14.
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11359 + ... + 11362.
245442 is an apocalyptic number.
45442 is a deficient number, since it is larger than the sum of its proper divisors (22724).
45442 is a wasteful number, since it uses less digits than its factorization.
45442 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 22723.
The product of its digits is 640, while the sum is 19.
The square root of 45442 is about 213.1712926264.
The cubic root of 45442 is about 35.6850091501.
Adding to 45442 its reverse (24454), we get a palindrome (69896).
It can be divided in two parts, 454 and 42, that added together give a triangular number (496 = T31).
The spelling of 45442 in words is "forty-five thousand, four hundred forty-two".