1278212522 has 8 divisors (see below), whose sum is σ = 1979167872. Its totient is φ = 618489900.

The previous prime is 1278212461. The next prime is 1278212527. The reversal of 1278212522 is 2252128721.

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

It is not an unprimeable number, because it can be changed into a prime (1278212527) 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, 10308104 + ... + 10308227.

It is an arithmetic number, because the mean of its divisors is an integer number (247395984).

Almost surely, 2^1278212522 is an apocalyptic number.

1278212522 is a deficient number, since it is larger than the sum of its proper divisors (700955350).

1278212522 is a wasteful number, since it uses less digits than its factorization.

1278212522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20616364.

The product of its digits is 8960, while the sum is 32.

The square root of 1278212522 is about 35752.0981482206. The cubic root of 1278212522 is about 1085.2613985066.

The spelling of 1278212522 in words is "one billion, two hundred seventy-eight million, two hundred twelve thousand, five hundred twenty-two".