1299260078 has 4 divisors (see below), whose sum is σ = 1948890120. Its totient is φ = 649630038.

The previous prime is 1299260051. The next prime is 1299260089. The reversal of 1299260078 is 8700629921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8700629921 = 331 ⋅26285891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324815018 + ... + 324815021.

It is an arithmetic number, because the mean of its divisors is an integer number (487222530).

Almost surely, 2^1299260078 is an apocalyptic number.

1299260078 is a deficient number, since it is larger than the sum of its proper divisors (649630042).

1299260078 is an equidigital number, since it uses as much as digits as its factorization.

1299260078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649630041.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1299260078 is about 36045.2504222124. The cubic root of 1299260078 is about 1091.1857807884.

Adding to 1299260078 its reverse (8700629921), we get a palindrome (9999889999).

The spelling of 1299260078 in words is "one billion, two hundred ninety-nine million, two hundred sixty thousand, seventy-eight".