1229812978 has 4 divisors (see below), whose sum is σ = 1844719470. Its totient is φ = 614906488.

The previous prime is 1229812949. The next prime is 1229813023. The reversal of 1229812978 is 8792189221.

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., 1099784569 + 130028409 = 33163^2 + 11403^2 .

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, 307453243 + ... + 307453246.

Almost surely, 2^1229812978 is an apocalyptic number.

1229812978 is a deficient number, since it is larger than the sum of its proper divisors (614906492).

1229812978 is an equidigital number, since it uses as much as digits as its factorization.

1229812978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614906491.

The product of its digits is 290304, while the sum is 49.

The square root of 1229812978 is about 35068.6894251838. The cubic root of 1229812978 is about 1071.3869625780.

The spelling of 1229812978 in words is "one billion, two hundred twenty-nine million, eight hundred twelve thousand, nine hundred seventy-eight".