1222394977 has 4 divisors (see below), whose sum is σ = 1222465540. Its totient is φ = 1222324416.

The previous prime is 1222394923. The next prime is 1222394989. The reversal of 1222394977 is 7794932221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 859721041 + 362673936 = 29321^2 + 19044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222394977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222394917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10549 + ... + 50557.

It is an arithmetic number, because the mean of its divisors is an integer number (305616385).

Almost surely, 2^1222394977 is an apocalyptic number.

It is an amenable number.

1222394977 is a deficient number, since it is larger than the sum of its proper divisors (70563).

1222394977 is an equidigital number, since it uses as much as digits as its factorization.

1222394977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70562.

The product of its digits is 381024, while the sum is 46.

The square root of 1222394977 is about 34962.7655799709. The cubic root of 1222394977 is about 1069.2284818873.

The spelling of 1222394977 in words is "one billion, two hundred twenty-two million, three hundred ninety-four thousand, nine hundred seventy-seven".