1223391278 has 8 divisors (see below), whose sum is σ = 1835242920. Its totient is φ = 611643640.

The previous prime is 1223391271. The next prime is 1223391283. The reversal of 1223391278 is 8721933221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223391271) 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, 18953 + ... + 52971.

It is an arithmetic number, because the mean of its divisors is an integer number (229405365).

Almost surely, 2^1223391278 is an apocalyptic number.

1223391278 is a deficient number, since it is larger than the sum of its proper divisors (611851642).

1223391278 is a wasteful number, since it uses less digits than its factorization.

1223391278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52002.

The product of its digits is 36288, while the sum is 38.

The square root of 1223391278 is about 34977.0107070344. The cubic root of 1223391278 is about 1069.5188910548.

The spelling of 1223391278 in words is "one billion, two hundred twenty-three million, three hundred ninety-one thousand, two hundred seventy-eight".