1288431 has 6 divisors (see below), whose sum is σ = 1861080. Its totient is φ = 858948.

The previous prime is 1288429. The next prime is 1288439. The reversal of 1288431 is 1348821.

It is not a de Polignac number, because 1288431 - 2¹ = 1288429 is a prime.

It is a super-2 number, since 2×1288431² = 3320108883522, which contains 22 as substring.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1288395 and 1288404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71571 + ... + 71588.

It is an arithmetic number, because the mean of its divisors is an integer number (310180).

2^1288431 is an apocalyptic number.

1288431 is a deficient number, since it is larger than the sum of its proper divisors (572649).

1288431 is a wasteful number, since it uses less digits than its factorization.

1288431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143165 (or 143162 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 1288431 is about 1135.0907452711. The cubic root of 1288431 is about 108.8145712444.

The spelling of 1288431 in words is "one million, two hundred eighty-eight thousand, four hundred thirty-one".