1289044940 has 12 divisors (see below), whose sum is σ = 2706994416. Its totient is φ = 515617968.

The previous prime is 1289044937. The next prime is 1289044951. The reversal of 1289044940 is 494409821.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 32226104 + ... + 32226143.

It is an arithmetic number, because the mean of its divisors is an integer number (225582868).

Almost surely, 2^1289044940 is an apocalyptic number.

1289044940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1289044940 is an abundant number, since it is smaller than the sum of its proper divisors (1417949476).

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

1289044940 is a wasteful number, since it uses less digits than its factorization.

1289044940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64452256 (or 64452254 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 1289044940 is about 35903.2719957388. The cubic root of 1289044940 is about 1088.3185195503.

The spelling of 1289044940 in words is "one billion, two hundred eighty-nine million, forty-four thousand, nine hundred forty".