1280416 has 12 divisors (see below), whose sum is σ = 2520882. Its totient is φ = 640192.

The previous prime is 1280407. The next prime is 1280417. The reversal of 1280416 is 6140821.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 156816 = 1060^2 + 396^2 .

It is not an unprimeable number, because it can be changed into a prime (1280417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19975 + ... + 20038.

2^1280416 is an apocalyptic number.

1280416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1280416 is a deficient number, since it is larger than the sum of its proper divisors (1240466).

1280416 is an equidigital number, since it uses as much as digits as its factorization.

1280416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40023 (or 40015 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1280416 is about 1131.5546827264. The cubic root of 1280416 is about 108.5884658661.

Adding to 1280416 its product of nonzero digits (384), we get a triangular number (1280800 = T₁₆₀₀).

The spelling of 1280416 in words is "one million, two hundred eighty thousand, four hundred sixteen".