1289265140 has 24 divisors (see below), whose sum is σ = 2849955360. Its totient is φ = 488563488.

The previous prime is 1289265139. The next prime is 1289265181. The reversal of 1289265140 is 415629821.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 1289265094 and 1289265103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1696022 + ... + 1696781.

It is an arithmetic number, because the mean of its divisors is an integer number (118748140).

Almost surely, 2^1289265140 is an apocalyptic number.

1289265140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1289265140 is an abundant number, since it is smaller than the sum of its proper divisors (1560690220).

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

1289265140 is a wasteful number, since it uses less digits than its factorization.

1289265140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392831 (or 3392829 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 1289265140 is about 35906.3384376631. The cubic root of 1289265140 is about 1088.3804863822.

The spelling of 1289265140 in words is "one billion, two hundred eighty-nine million, two hundred sixty-five thousand, one hundred forty".