280961946 has 48 divisors (see below), whose sum is σ = 633657024. Its totient is φ = 93304224.

The previous prime is 280961939. The next prime is 280961977. The reversal of 280961946 is 649169082.

It is a happy number.

280961946 is a `hidden beast` number, since 28 + 0 + 9 + 619 + 4 + 6 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151195 + ... + 153041.

It is an arithmetic number, because the mean of its divisors is an integer number (13201188).

Almost surely, 2^280961946 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280961946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316828512).

280961946 is an abundant number, since it is smaller than the sum of its proper divisors (352695078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280961946 is a wasteful number, since it uses less digits than its factorization.

280961946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177 (or 2165 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 280961946 is about 16761.9195201504. The cubic root of 280961946 is about 654.9615936147.

The spelling of 280961946 in words is "two hundred eighty million, nine hundred sixty-one thousand, nine hundred forty-six".