1278229398 has 8 divisors (see below), whose sum is σ = 2556458808. Its totient is φ = 426076464.

The previous prime is 1278229391. The next prime is 1278229399. The reversal of 1278229398 is 8939228721.

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

1278229398 is an admirable number.

It is a super-2 number, since 2×1278229398² = 3267740787822884808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1278229398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278229391) 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, 106519111 + ... + 106519122.

It is an arithmetic number, because the mean of its divisors is an integer number (319557351).

Almost surely, 2^1278229398 is an apocalyptic number.

1278229398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1278229398 is a wasteful number, since it uses less digits than its factorization.

1278229398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213038238.

The product of its digits is 870912, while the sum is 51.

The square root of 1278229398 is about 35752.3341615621. The cubic root of 1278229398 is about 1085.2661746531.

The spelling of 1278229398 in words is "one billion, two hundred seventy-eight million, two hundred twenty-nine thousand, three hundred ninety-eight".