1280940506 has 8 divisors (see below), whose sum is σ = 1923055104. Its totient is φ = 639922140.

The previous prime is 1280940473. The next prime is 1280940509. The reversal of 1280940506 is 6050490821.

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

It is not an unprimeable number, because it can be changed into a prime (1280940509) 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, 271130 + ... + 275813.

It is an arithmetic number, because the mean of its divisors is an integer number (240381888).

Almost surely, 2^1280940506 is an apocalyptic number.

1280940506 is a deficient number, since it is larger than the sum of its proper divisors (642114598).

1280940506 is a wasteful number, since it uses less digits than its factorization.

1280940506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548116.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1280940506 is about 35790.2291973661. The cubic root of 1280940506 is about 1086.0329113295.

The spelling of 1280940506 in words is "one billion, two hundred eighty million, nine hundred forty thousand, five hundred six".