1218455 has 16 divisors (see below), whose sum is σ = 1726464. Its totient is φ = 807840.

The previous prime is 1218449. The next prime is 1218457. The reversal of 1218455 is 5548121.

It is not a de Polignac number, because 1218455 - 2⁶ = 1218391 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 (1218457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 524 + ... + 1646.

It is an arithmetic number, because the mean of its divisors is an integer number (107904).

2^1218455 is an apocalyptic number.

1218455 is a deficient number, since it is larger than the sum of its proper divisors (508009).

1218455 is a wasteful number, since it uses less digits than its factorization.

1218455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166.

The product of its digits is 1600, while the sum is 26.

The square root of 1218455 is about 1103.8364915149. The cubic root of 1218455 is about 106.8078479927.

The spelling of 1218455 in words is "one million, two hundred eighteen thousand, four hundred fifty-five".