1286731 has 8 divisors (see below), whose sum is σ = 1326960. Its totient is φ = 1247232.

The previous prime is 1286711. The next prime is 1286773. The reversal of 1286731 is 1376821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1286731 - 2¹⁵ = 1253963 is a prime.

It is a super-2 number, since 2×1286731² = 3311353332722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1286731.

It is not an unprimeable number, because it can be changed into a prime (1286711) 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, 6571 + ... + 6763.

It is an arithmetic number, because the mean of its divisors is an integer number (165870).

2^1286731 is an apocalyptic number.

1286731 is a deficient number, since it is larger than the sum of its proper divisors (40229).

1286731 is a wasteful number, since it uses less digits than its factorization.

1286731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

The product of its digits is 2016, while the sum is 28.

The square root of 1286731 is about 1134.3416592897. The cubic root of 1286731 is about 108.7666922895.

It can be divided in two parts, 128 and 6731, that added together give a cube (6859 = 19³).

The spelling of 1286731 in words is "one million, two hundred eighty-six thousand, seven hundred thirty-one".