1278634445 has 8 divisors (see below), whose sum is σ = 1673848800. Its totient is φ = 929915920.

The previous prime is 1278634433. The next prime is 1278634453. The reversal of 1278634445 is 5444368721.

It is a happy number.

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

It is not a de Polignac number, because 1278634445 - 2¹⁶ = 1278568909 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1278634396 and 1278634405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11623895 + ... + 11624004.

It is an arithmetic number, because the mean of its divisors is an integer number (209231100).

Almost surely, 2^1278634445 is an apocalyptic number.

It is an amenable number.

1278634445 is a deficient number, since it is larger than the sum of its proper divisors (395214355).

1278634445 is a wasteful number, since it uses less digits than its factorization.

1278634445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23247915.

The product of its digits is 645120, while the sum is 44.

The square root of 1278634445 is about 35757.9983360367. The cubic root of 1278634445 is about 1085.3807960674.

The spelling of 1278634445 in words is "one billion, two hundred seventy-eight million, six hundred thirty-four thousand, four hundred forty-five".