1222678406 has 4 divisors (see below), whose sum is σ = 1834017612. Its totient is φ = 611339202.

The previous prime is 1222678393. The next prime is 1222678411. The reversal of 1222678406 is 6048762221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6048762221 = 25667 ⋅235663.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222678406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305669600 + ... + 305669603.

It is an arithmetic number, because the mean of its divisors is an integer number (458504403).

Almost surely, 2^1222678406 is an apocalyptic number.

1222678406 is a deficient number, since it is larger than the sum of its proper divisors (611339206).

1222678406 is an equidigital number, since it uses as much as digits as its factorization.

1222678406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611339205.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 1222678406 is about 34966.8186428219. The cubic root of 1222678406 is about 1069.3111139186.

The spelling of 1222678406 in words is "one billion, two hundred twenty-two million, six hundred seventy-eight thousand, four hundred six".