1206277978 has 4 divisors (see below), whose sum is σ = 1809416970. Its totient is φ = 603138988.

The previous prime is 1206277967. The next prime is 1206277981. The reversal of 1206277978 is 8797726021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 756965169 + 449312809 = 27513^2 + 21197^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 301569493 + ... + 301569496.

Almost surely, 2^1206277978 is an apocalyptic number.

1206277978 is a deficient number, since it is larger than the sum of its proper divisors (603138992).

1206277978 is an equidigital number, since it uses as much as digits as its factorization.

1206277978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603138991.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 1206277978 is about 34731.5127513905. The cubic root of 1206277978 is about 1064.5084988404.

The spelling of 1206277978 in words is "one billion, two hundred six million, two hundred seventy-seven thousand, nine hundred seventy-eight".