1287401 has 2 divisors, whose sum is σ = 1287402. Its totient is φ = 1287400.

The previous prime is 1287373. The next prime is 1287431. The reversal of 1287401 is 1047821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1263376 + 24025 = 1124^2 + 155^2 .

It is an emirp because it is prime and its reverse (1047821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287401 - 2¹⁸ = 1025257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1287431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643700 + 643701.

It is an arithmetic number, because the mean of its divisors is an integer number (643701).

2^1287401 is an apocalyptic number.

It is an amenable number.

1287401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287401 is an equidigital number, since it uses as much as digits as its factorization.

1287401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1287401 is about 1134.6369463401. The cubic root of 1287401 is about 108.7855672626.

The spelling of 1287401 in words is "one million, two hundred eighty-seven thousand, four hundred one".