245643442 has 16 divisors (see below), whose sum is σ = 414929664. Its totient is φ = 108054000.

The previous prime is 245643403. The next prime is 245643449. The reversal of 245643442 is 244346542.

It is a junction number, because it is equal to n+sod(n) for n = 245643398 and 245643407.

It is not an unprimeable number, because it can be changed into a prime (245643449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179409 + ... + 180772.

It is an arithmetic number, because the mean of its divisors is an integer number (25933104).

Almost surely, 2^245643442 is an apocalyptic number.

245643442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

245643442 is a deficient number, since it is larger than the sum of its proper divisors (169286222).

245643442 is a wasteful number, since it uses less digits than its factorization.

245643442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360225.

The product of its digits is 92160, while the sum is 34.

The square root of 245643442 is about 15673.0163657159. The cubic root of 245643442 is about 626.2797815062.

Adding to 245643442 its reverse (244346542), we get a palindrome (489989984).

The spelling of 245643442 in words is "two hundred forty-five million, six hundred forty-three thousand, four hundred forty-two".