1278459973 has 8 divisors (see below), whose sum is σ = 1537997120. Its totient is φ = 1038147840.

The previous prime is 1278459937. The next prime is 1278459977. The reversal of 1278459973 is 3799548721.

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 1278459973 - 2¹⁷ = 1278328901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278459977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4806108 + ... + 4806373.

It is an arithmetic number, because the mean of its divisors is an integer number (192249640).

Almost surely, 2^1278459973 is an apocalyptic number.

It is an amenable number.

1278459973 is a deficient number, since it is larger than the sum of its proper divisors (259537147).

1278459973 is an equidigital number, since it uses as much as digits as its factorization.

1278459973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9612507.

The product of its digits is 3810240, while the sum is 55.

The square root of 1278459973 is about 35755.5586307919. The cubic root of 1278459973 is about 1085.3314264260.

The spelling of 1278459973 in words is "one billion, two hundred seventy-eight million, four hundred fifty-nine thousand, nine hundred seventy-three".