1286049640 has 32 divisors (see below), whose sum is σ = 2898802080. Its totient is φ = 513497152.

The previous prime is 1286049617. The next prime is 1286049647. The reversal of 1286049640 is 469406821.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1286049593 and 1286049602.

It is not an unprimeable number, because it can be changed into a prime (1286049647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6034 + ... + 51073.

It is an arithmetic number, because the mean of its divisors is an integer number (90587565).

Almost surely, 2^1286049640 is an apocalyptic number.

1286049640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1286049640 is an abundant number, since it is smaller than the sum of its proper divisors (1612752440).

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

1286049640 is a wasteful number, since it uses less digits than its factorization.

1286049640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57681 (or 57677 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 1286049640 is about 35861.5342672340. The cubic root of 1286049640 is about 1087.4749056613.

It can be divided in two parts, 12860 and 49640, that added together give a square (62500 = 250²).

The spelling of 1286049640 in words is "one billion, two hundred eighty-six million, forty-nine thousand, six hundred forty".