1220878 has 4 divisors (see below), whose sum is σ = 1831320. Its totient is φ = 610438.

The previous prime is 1220839. The next prime is 1220893. The reversal of 1220878 is 8780221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8780221 = 73 ⋅120277.

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, 305218 + ... + 305221.

It is an arithmetic number, because the mean of its divisors is an integer number (457830).

2^1220878 is an apocalyptic number.

1220878 is a deficient number, since it is larger than the sum of its proper divisors (610442).

1220878 is an equidigital number, since it uses as much as digits as its factorization.

1220878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610441.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 1220878 is about 1104.9334821608. The cubic root of 1220878 is about 106.8785999038.

The spelling of 1220878 in words is "one million, two hundred twenty thousand, eight hundred seventy-eight".