1215878 has 4 divisors (see below), whose sum is σ = 1823820. Its totient is φ = 607938.

The previous prime is 1215859. The next prime is 1215881. The reversal of 1215878 is 8785121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303968 + ... + 303971.

It is an arithmetic number, because the mean of its divisors is an integer number (455955).

2^1215878 is an apocalyptic number.

1215878 is a deficient number, since it is larger than the sum of its proper divisors (607942).

1215878 is an equidigital number, since it uses as much as digits as its factorization.

1215878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607941.

The product of its digits is 4480, while the sum is 32.

The square root of 1215878 is about 1102.6685812156. The cubic root of 1215878 is about 106.7324962571.

The spelling of 1215878 in words is "one million, two hundred fifteen thousand, eight hundred seventy-eight".