1222209978 has 32 divisors (see below), whose sum is σ = 2669118912. Its totient is φ = 370022400.

The previous prime is 1222209973. The next prime is 1222209983. The reversal of 1222209978 is 8799022221.

It is an interprime number because it is at equal distance from previous prime (1222209973) and next prime (1222209983).

It is not an unprimeable number, because it can be changed into a prime (1222209973) 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, 68068 + ... + 84128.

It is an arithmetic number, because the mean of its divisors is an integer number (83409966).

Almost surely, 2^1222209978 is an apocalyptic number.

1222209978 is an abundant number, since it is smaller than the sum of its proper divisors (1446908934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222209978 is a wasteful number, since it uses less digits than its factorization.

1222209978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17230.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1222209978 is about 34960.1198224491. The cubic root of 1222209978 is about 1069.1745396446.

The spelling of 1222209978 in words is "one billion, two hundred twenty-two million, two hundred nine thousand, nine hundred seventy-eight".