1306573978 has 16 divisors (see below), whose sum is σ = 2012872680. Its totient is φ = 635699200.

The previous prime is 1306573973. The next prime is 1306573979. The reversal of 1306573978 is 8793756031.

It can be written as a sum of positive squares in 4 ways, for example, as 920333569 + 386240409 = 30337^2 + 19653^2 .

It is not an unprimeable number, because it can be changed into a prime (1306573973) 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, 11418 + ... + 52378.

Almost surely, 2^1306573978 is an apocalyptic number.

1306573978 is a deficient number, since it is larger than the sum of its proper divisors (706298702).

1306573978 is a wasteful number, since it uses less digits than its factorization.

1306573978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41393.

The product of its (nonzero) digits is 952560, while the sum is 49.

The square root of 1306573978 is about 36146.5624645000. The cubic root of 1306573978 is about 1093.2294811588.

The spelling of 1306573978 in words is "one billion, three hundred six million, five hundred seventy-three thousand, nine hundred seventy-eight".