1286494440 has 512 divisors, whose sum is σ = 5106032640. Its totient is φ = 251596800.

The previous prime is 1286494393. The next prime is 1286494483. The reversal of 1286494440 is 444946821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1286494392 and 1286494401.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 18119605 + ... + 18119675.

It is an arithmetic number, because the mean of its divisors is an integer number (9972720).

Almost surely, 2^1286494440 is an apocalyptic number.

1286494440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286494440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2553016320).

1286494440 is an abundant number, since it is smaller than the sum of its proper divisors (3819538200).

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

1286494440 is a wasteful number, since it uses less digits than its factorization.

1286494440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 1286494440 is about 35867.7353620214. The cubic root of 1286494440 is about 1087.6002645038.

The spelling of 1286494440 in words is "one billion, two hundred eighty-six million, four hundred ninety-four thousand, four hundred forty".