1284215 has 8 divisors (see below), whose sum is σ = 1556928. Its totient is φ = 1016800.

The previous prime is 1284211. The next prime is 1284223. The reversal of 1284215 is 5124821.

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

It is not a de Polignac number, because 1284215 - 2² = 1284211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284211) 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, 767 + ... + 1776.

It is an arithmetic number, because the mean of its divisors is an integer number (194616).

2^1284215 is an apocalyptic number.

1284215 is a deficient number, since it is larger than the sum of its proper divisors (272713).

1284215 is a wasteful number, since it uses less digits than its factorization.

1284215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649.

The product of its digits is 640, while the sum is 23.

The square root of 1284215 is about 1133.2321033222. The cubic root of 1284215 is about 108.6957539825.

Subtracting 1284215 from its reverse (5124821), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 1284215 in words is "one million, two hundred eighty-four thousand, two hundred fifteen".