1280455965 has 32 divisors (see below), whose sum is σ = 2286627840. Its totient is φ = 679831488.

The previous prime is 1280455949. The next prime is 1280455973. The reversal of 1280455965 is 5695540821.

1280455965 is a `hidden beast` number, since 12 + 8 + 0 + 45 + 596 + 5 = 666.

It is not a de Polignac number, because 1280455965 - 2⁴ = 1280455949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1280455965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8839 + ... + 51371.

It is an arithmetic number, because the mean of its divisors is an integer number (71457120).

Almost surely, 2^1280455965 is an apocalyptic number.

1280455965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1280455965 is a deficient number, since it is larger than the sum of its proper divisors (1006171875).

1280455965 is a wasteful number, since it uses less digits than its factorization.

1280455965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42770 (or 42764 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The square root of 1280455965 is about 35783.4593772039. The cubic root of 1280455965 is about 1085.8959562728.

The spelling of 1280455965 in words is "one billion, two hundred eighty million, four hundred fifty-five thousand, nine hundred sixty-five".