1287545 has 8 divisors (see below), whose sum is σ = 1765824. Its totient is φ = 882864.

The previous prime is 1287541. The next prime is 1287551. The reversal of 1287545 is 5457821.

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 1287545 - 2² = 1287541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1287541) 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, 18359 + ... + 18428.

It is an arithmetic number, because the mean of its divisors is an integer number (220728).

2^1287545 is an apocalyptic number.

It is an amenable number.

1287545 is a deficient number, since it is larger than the sum of its proper divisors (478279).

1287545 is an equidigital number, since it uses as much as digits as its factorization.

1287545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36799.

The product of its digits is 11200, while the sum is 32.

The square root of 1287545 is about 1134.7004009870. The cubic root of 1287545 is about 108.7896231182.

The spelling of 1287545 in words is "one million, two hundred eighty-seven thousand, five hundred forty-five".