449978861 has 4 divisors (see below), whose sum is σ = 450056412. Its totient is φ = 449901312.

The previous prime is 449978849. The next prime is 449978863. The reversal of 449978861 is 168879944.

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

It can be written as a sum of positive squares in 2 ways, for example, as 286624900 + 163353961 = 16930^2 + 12781^2 .

It is a cyclic number.

It is not a de Polignac number, because 449978861 - 2²⁶ = 382869997 is a prime.

It is a super-3 number, since 3×449978861³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 449978797 and 449978806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (449978863) 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, 29300 + ... + 41933.

It is an arithmetic number, because the mean of its divisors is an integer number (112514103).

Almost surely, 2^449978861 is an apocalyptic number.

It is an amenable number.

449978861 is a deficient number, since it is larger than the sum of its proper divisors (77551).

449978861 is an equidigital number, since it uses as much as digits as its factorization.

449978861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77550.

The product of its digits is 3483648, while the sum is 56.

The square root of 449978861 is about 21212.7051787366. The cubic root of 449978861 is about 766.2974329352.

The spelling of 449978861 in words is "four hundred forty-nine million, nine hundred seventy-eight thousand, eight hundred sixty-one".