1280406746 has 8 divisors (see below), whose sum is σ = 1926669780. Its totient is φ = 638183488.

The previous prime is 1280406737. The next prime is 1280406763. The reversal of 1280406746 is 6476040821.

It can be written as a sum of positive squares in 2 ways, for example, as 1268428225 + 11978521 = 35615^2 + 3461^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1009151 + ... + 1010418.

Almost surely, 2^1280406746 is an apocalyptic number.

1280406746 is a deficient number, since it is larger than the sum of its proper divisors (646263034).

1280406746 is a wasteful number, since it uses less digits than its factorization.

1280406746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019888.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 1280406746 is about 35782.7716366410. The cubic root of 1280406746 is about 1085.8820426360.

The spelling of 1280406746 in words is "one billion, two hundred eighty million, four hundred six thousand, seven hundred forty-six".