1287423 has 12 divisors (see below), whose sum is σ = 1895400. Its totient is φ = 841776.

The previous prime is 1287401. The next prime is 1287431. The reversal of 1287423 is 3247821.

It is not a de Polignac number, because 1287423 - 2¹⁰ = 1286399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 873 + ... + 1826.

It is an arithmetic number, because the mean of its divisors is an integer number (157950).

2^1287423 is an apocalyptic number.

1287423 is a deficient number, since it is larger than the sum of its proper divisors (607977).

1287423 is a wasteful number, since it uses less digits than its factorization.

1287423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758 (or 2755 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1287423 is about 1134.6466410297. The cubic root of 1287423 is about 108.7861869268.

It can be divided in two parts, 12 and 87423, that multiplied together give a triangular number (1049076 = T₁₄₄₈).

The spelling of 1287423 in words is "one million, two hundred eighty-seven thousand, four hundred twenty-three".